diff --git a/microservices/CharacterApi/Controllers/CharactersController.cs b/microservices/CharacterApi/Controllers/CharactersController.cs
index 1e5770a..8b3c8a7 100644
--- a/microservices/CharacterApi/Controllers/CharactersController.cs
+++ b/microservices/CharacterApi/Controllers/CharactersController.cs
@@ -68,11 +68,28 @@ public class CharactersController : ControllerBase
         var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
         if (string.IsNullOrWhiteSpace(userId))
             return Unauthorized();
-
+
         var characters = await _characters.GetForOwnerAsync(userId);
         return Ok(characters);
     }
 
+    [HttpPost("internal/reset-coords")]
+    public async Task<IActionResult> ResetCoordsInternal([FromBody] InternalResetCharactersToCoordRequest req)
+    {
+        var configuredKey = (_configuration["InternalApi:Key"] ?? _configuration["Jwt:Key"] ?? string.Empty).Trim();
+        var requestKey = (Request.Headers["X-Internal-Api-Key"].FirstOrDefault() ?? string.Empty).Trim();
+        if (string.IsNullOrWhiteSpace(configuredKey) || !string.Equals(configuredKey, requestKey, StringComparison.Ordinal))
+            return Unauthorized();
+        if (req.Coord is null)
+            return BadRequest("coord required");
+
+        var updatedCharacterCount = await _characters.ResetAllCoordsAsync(req.Coord);
+        return Ok(new InternalResetCharactersToCoordResponse
+        {
+            UpdatedCharacterCount = updatedCharacterCount
+        });
+    }
+
     [HttpGet("{id}/visible-locations")]
     [Authorize(Roles = "USER,SUPER")]
     public async Task<IActionResult> VisibleLocations(string id)
diff --git a/microservices/CharacterApi/Models/InternalResetCharactersToCoordRequest.cs b/microservices/CharacterApi/Models/InternalResetCharactersToCoordRequest.cs
new file mode 100644
index 0000000..ce56b27
--- /dev/null
+++ b/microservices/CharacterApi/Models/InternalResetCharactersToCoordRequest.cs
@@ -0,0 +1,6 @@
+namespace CharacterApi.Models;
+
+public class InternalResetCharactersToCoordRequest
+{
+    public required Coord Coord { get; set; }
+}
diff --git a/microservices/CharacterApi/Models/InternalResetCharactersToCoordResponse.cs b/microservices/CharacterApi/Models/InternalResetCharactersToCoordResponse.cs
new file mode 100644
index 0000000..31a702c
--- /dev/null
+++ b/microservices/CharacterApi/Models/InternalResetCharactersToCoordResponse.cs
@@ -0,0 +1,6 @@
+namespace CharacterApi.Models;
+
+public class InternalResetCharactersToCoordResponse
+{
+    public int UpdatedCharacterCount { get; set; }
+}
diff --git a/microservices/CharacterApi/Services/CharacterStore.cs b/microservices/CharacterApi/Services/CharacterStore.cs
index 85c80be..107569e 100644
--- a/microservices/CharacterApi/Services/CharacterStore.cs
+++ b/microservices/CharacterApi/Services/CharacterStore.cs
@@ -49,6 +49,15 @@ public class CharacterStore
         return result.ModifiedCount > 0 || result.MatchedCount > 0;
     }
 
+    public async Task<int> ResetAllCoordsAsync(Coord coord)
+    {
+        var update = Builders<Character>.Update
+            .Set(c => c.Coord, coord)
+            .Set(c => c.LastSeenUtc, DateTime.UtcNow);
+        var result = await _col.UpdateManyAsync(Builders<Character>.Filter.Empty, update);
+        return (int)result.MatchedCount;
+    }
+
     public async Task<List<VisibleCharacter>> GetVisibleOthersAsync(string characterId, int x, int y, int radius, DateTime onlineSinceUtc)
     {
         var characters = await _col.Find(c =>
diff --git a/microservices/InventoryApi/Controllers/InventoryController.cs b/microservices/InventoryApi/Controllers/InventoryController.cs
index 0955649..9e73407 100644
--- a/microservices/InventoryApi/Controllers/InventoryController.cs
+++ b/microservices/InventoryApi/Controllers/InventoryController.cs
@@ -48,6 +48,28 @@ public class InventoryController : ControllerBase
         return Ok(response);
     }
 
+    [HttpPost("internal/location-owner/reassign")]
+    public async Task<IActionResult> ReassignLocationOwnerInventoryInternal([FromBody] InternalReassignLocationInventoryRequest req)
+    {
+        var configuredKey = (HttpContext.RequestServices.GetRequiredService<IConfiguration>()["InternalApi:Key"]
+            ?? HttpContext.RequestServices.GetRequiredService<IConfiguration>()["Jwt:Key"]
+            ?? string.Empty).Trim();
+        var requestKey = (Request.Headers["X-Internal-Api-Key"].FirstOrDefault() ?? string.Empty).Trim();
+        if (string.IsNullOrWhiteSpace(configuredKey) || !string.Equals(configuredKey, requestKey, StringComparison.Ordinal))
+            return Unauthorized();
+        if (string.IsNullOrWhiteSpace(req.ToOwnerId))
+            return BadRequest("toOwnerId required");
+
+        var result = await _inventory.ReassignLocationInventoryOwnersAsync(req.FromOwnerIds, req.ToOwnerId);
+        if (!result.TargetLocationExists)
+            return NotFound("Target location not found");
+
+        return Ok(new InternalReassignLocationInventoryResponse
+        {
+            ReassignedItemCount = result.ReassignedItemCount
+        });
+    }
+
     [HttpGet("item-definitions")]
     [Authorize(Roles = "USER,SUPER")]
     public async Task<IActionResult> ListItemDefinitions()
diff --git a/microservices/InventoryApi/Models/InternalReassignLocationInventoryRequest.cs b/microservices/InventoryApi/Models/InternalReassignLocationInventoryRequest.cs
new file mode 100644
index 0000000..02c7ea6
--- /dev/null
+++ b/microservices/InventoryApi/Models/InternalReassignLocationInventoryRequest.cs
@@ -0,0 +1,8 @@
+namespace InventoryApi.Models;
+
+public class InternalReassignLocationInventoryRequest
+{
+    public List<string> FromOwnerIds { get; set; } = [];
+
+    public string ToOwnerId { get; set; } = string.Empty;
+}
diff --git a/microservices/InventoryApi/Models/InternalReassignLocationInventoryResponse.cs b/microservices/InventoryApi/Models/InternalReassignLocationInventoryResponse.cs
new file mode 100644
index 0000000..4181435
--- /dev/null
+++ b/microservices/InventoryApi/Models/InternalReassignLocationInventoryResponse.cs
@@ -0,0 +1,6 @@
+namespace InventoryApi.Models;
+
+public class InternalReassignLocationInventoryResponse
+{
+    public int ReassignedItemCount { get; set; }
+}
diff --git a/microservices/InventoryApi/Services/InventoryStore.cs b/microservices/InventoryApi/Services/InventoryStore.cs
index 4bd318d..c9926e4 100644
--- a/microservices/InventoryApi/Services/InventoryStore.cs
+++ b/microservices/InventoryApi/Services/InventoryStore.cs
@@ -22,6 +22,7 @@ public class InventoryStore
     private readonly string _dbName;
 
     public sealed record GrantResult(List<InventoryItem> Items, int RequestedQuantity, int GrantedQuantity, int OverflowQuantity);
+    public sealed record ReassignLocationInventoryResult(bool TargetLocationExists, int ReassignedItemCount);
 
     public InventoryStore(IConfiguration cfg)
     {
@@ -114,6 +115,35 @@ public class InventoryStore
             .ToDictionary(group => group.Key, group => group.ToList(), StringComparer.Ordinal);
     }
 
+    public async Task<ReassignLocationInventoryResult> ReassignLocationInventoryOwnersAsync(IEnumerable<string> fromOwnerIds, string toOwnerId)
+    {
+        var normalizedToOwnerId = toOwnerId.Trim();
+        var targetExists = await _locations.Find(location => location.Id == normalizedToOwnerId).AnyAsync();
+        if (!targetExists)
+            return new ReassignLocationInventoryResult(false, 0);
+
+        var sourceOwnerIds = fromOwnerIds
+            .Where(id => !string.IsNullOrWhiteSpace(id))
+            .Select(id => id.Trim())
+            .Where(id => !string.Equals(id, normalizedToOwnerId, StringComparison.Ordinal))
+            .Distinct(StringComparer.Ordinal)
+            .ToList();
+        if (sourceOwnerIds.Count == 0)
+            return new ReassignLocationInventoryResult(true, 0);
+
+        var filter = Builders<InventoryItem>.Filter.And(
+            Builders<InventoryItem>.Filter.Eq(item => item.OwnerType, LocationOwnerType),
+            Builders<InventoryItem>.Filter.In(item => item.OwnerId, sourceOwnerIds));
+        var update = Builders<InventoryItem>.Update
+            .Set(item => item.OwnerId, normalizedToOwnerId)
+            .Set(item => item.OwnerUserId, null)
+            .Unset(item => item.Slot)
+            .Unset(item => item.EquippedSlot)
+            .Set(item => item.UpdatedUtc, DateTime.UtcNow);
+        var result = await _items.UpdateManyAsync(filter, update);
+        return new ReassignLocationInventoryResult(true, (int)result.ModifiedCount);
+    }
+
     public Task<List<ItemDefinition>> ListItemDefinitionsAsync() =>
         _definitions.Find(Builders<ItemDefinition>.Filter.Empty).SortBy(d => d.ItemKey).ToListAsync();
 
diff --git a/microservices/LocationsApi/Controllers/LocationsController.cs b/microservices/LocationsApi/Controllers/LocationsController.cs
index 8aa35af..f79db79 100644
--- a/microservices/LocationsApi/Controllers/LocationsController.cs
+++ b/microservices/LocationsApi/Controllers/LocationsController.cs
@@ -14,6 +14,8 @@ namespace LocationsApi.Controllers;
 [Route("api/[controller]")]
 public class LocationsController : ControllerBase
 {
+    private const string ResetWorldConfirmationPhrase = "RESET WORLD TO ORIGIN";
+    private static readonly Coord OriginCoord = new() { X = 0, Y = 0 };
     private readonly LocationStore _locations;
     private readonly IHttpClientFactory _httpClientFactory;
     private readonly IConfiguration _configuration;
@@ -131,6 +133,63 @@ public class LocationsController : ControllerBase
         return Ok(locations);
     }
 
+    [HttpPost("reset-world")]
+    [Authorize(Roles = "SUPER")]
+    public async Task<IActionResult> ResetWorld([FromBody] ResetWorldRequest req)
+    {
+        if (!req.ConfirmDeleteAllNonOriginLocations)
+            return BadRequest("confirmDeleteAllNonOriginLocations must be true");
+        if (!string.Equals(req.ConfirmationPhrase?.Trim(), ResetWorldConfirmationPhrase, StringComparison.Ordinal))
+            return BadRequest($"confirmationPhrase must exactly match '{ResetWorldConfirmationPhrase}'");
+
+        try
+        {
+            var limbo = await _locations.EnsureLimboLocationAsync();
+            if (string.IsNullOrWhiteSpace(limbo.Id))
+                return StatusCode(StatusCodes.Status500InternalServerError, "Limbo location was created without an id");
+
+            var movedCharacterCount = await ResetCharactersToOriginAsync();
+            var locationIdsToReassign = await _locations.GetLocationIdsForWorldResetAsync(limbo.Id);
+            var reassignedInventoryItemCount = await ReassignLocationInventoryToLimboAsync(locationIdsToReassign, limbo.Id);
+            var result = await _locations.ResetWorldToOriginAsync(limbo.Id);
+            result.MovedCharacterCount = movedCharacterCount;
+            result.ReassignedInventoryItemCount = reassignedInventoryItemCount;
+            _logger.LogWarning(
+                "World reset to origin by user {UserId}. DeletedLocationCount={DeletedLocationCount} MovedCharacterCount={MovedCharacterCount} ReassignedInventoryItemCount={ReassignedInventoryItemCount}",
+                User.FindFirstValue(ClaimTypes.NameIdentifier) ?? "unknown",
+                result.DeletedLocationCount,
+                result.MovedCharacterCount,
+                result.ReassignedInventoryItemCount);
+            return Ok(result);
+        }
+        catch (InvalidOperationException ex)
+        {
+            _logger.LogWarning(ex, "World reset failed because biome definitions are unavailable.");
+            return Conflict("Cannot reset world because no biome definitions exist.");
+        }
+        catch (InternalServiceCallException ex)
+        {
+            _logger.LogError(
+                ex,
+                "World reset failed while calling {ServiceName}. StatusCode={StatusCode}",
+                ex.ServiceName,
+                ex.StatusCode);
+            return StatusCode(ex.StatusCode, ex.ResponseBody);
+        }
+        catch (HttpRequestException ex)
+        {
+            _logger.LogError(ex, "World reset failed while reaching a dependent internal service.");
+            return StatusCode(StatusCodes.Status502BadGateway, new
+            {
+                type = "https://httpstatuses.com/502",
+                title = "Bad Gateway",
+                status = 502,
+                detail = "Failed to reach a dependent internal service during world reset.",
+                traceId = HttpContext.TraceIdentifier
+            });
+        }
+    }
+
     [HttpDelete("{id}")]
     [Authorize(Roles = "SUPER")]
     public async Task<IActionResult> Delete(string id)
@@ -435,4 +494,83 @@ public class LocationsController : ControllerBase
 
         public List<FloorInventoryItemResponse> Items { get; set; } = [];
     }
+
+    private async Task<int> ResetCharactersToOriginAsync()
+    {
+        var characterBaseUrl = (_configuration["Services:CharacterApiBaseUrl"] ?? "http://localhost:50785").TrimEnd('/');
+        var internalApiKey = (_configuration["InternalApi:Key"] ?? _configuration["Jwt:Key"] ?? string.Empty).Trim();
+        var body = JsonSerializer.Serialize(new { coord = OriginCoord });
+
+        var client = _httpClientFactory.CreateClient();
+        using var request = new HttpRequestMessage(HttpMethod.Post, $"{characterBaseUrl}/api/characters/internal/reset-coords");
+        request.Content = new StringContent(body, Encoding.UTF8, "application/json");
+        request.Headers.Add("X-Internal-Api-Key", internalApiKey);
+
+        using var response = await client.SendAsync(request);
+        var responseBody = await response.Content.ReadAsStringAsync();
+        if (!response.IsSuccessStatusCode)
+            throw new InternalServiceCallException("CharacterApi", (int)response.StatusCode, responseBody);
+
+        if (string.IsNullOrWhiteSpace(responseBody))
+            return 0;
+
+        using var json = JsonDocument.Parse(responseBody);
+        return json.RootElement.TryGetProperty("updatedCharacterCount", out var countElement) && countElement.ValueKind == JsonValueKind.Number
+            ? countElement.GetInt32()
+            : 0;
+    }
+
+    private async Task<int> ReassignLocationInventoryToLimboAsync(IEnumerable<string> fromOwnerIds, string toOwnerId)
+    {
+        var ownerIds = fromOwnerIds
+            .Where(id => !string.IsNullOrWhiteSpace(id))
+            .Select(id => id.Trim())
+            .Distinct(StringComparer.Ordinal)
+            .ToList();
+        if (ownerIds.Count == 0)
+            return 0;
+
+        var inventoryBaseUrl = (_configuration["Services:InventoryApiBaseUrl"] ?? "http://localhost:5003").TrimEnd('/');
+        var internalApiKey = (_configuration["InternalApi:Key"] ?? _configuration["Jwt:Key"] ?? string.Empty).Trim();
+        var body = JsonSerializer.Serialize(new
+        {
+            fromOwnerIds = ownerIds,
+            toOwnerId
+        });
+
+        var client = _httpClientFactory.CreateClient();
+        using var request = new HttpRequestMessage(HttpMethod.Post, $"{inventoryBaseUrl}/api/inventory/internal/location-owner/reassign");
+        request.Content = new StringContent(body, Encoding.UTF8, "application/json");
+        request.Headers.Add("X-Internal-Api-Key", internalApiKey);
+
+        using var response = await client.SendAsync(request);
+        var responseBody = await response.Content.ReadAsStringAsync();
+        if (!response.IsSuccessStatusCode)
+            throw new InternalServiceCallException("InventoryApi", (int)response.StatusCode, responseBody);
+
+        if (string.IsNullOrWhiteSpace(responseBody))
+            return 0;
+
+        using var json = JsonDocument.Parse(responseBody);
+        return json.RootElement.TryGetProperty("reassignedItemCount", out var countElement) && countElement.ValueKind == JsonValueKind.Number
+            ? countElement.GetInt32()
+            : 0;
+    }
+
+    private sealed class InternalServiceCallException : Exception
+    {
+        public InternalServiceCallException(string serviceName, int statusCode, string responseBody)
+            : base($"{serviceName} returned {statusCode}")
+        {
+            ServiceName = serviceName;
+            StatusCode = statusCode;
+            ResponseBody = responseBody;
+        }
+
+        public string ServiceName { get; }
+
+        public int StatusCode { get; }
+
+        public string ResponseBody { get; }
+    }
 }
diff --git a/microservices/LocationsApi/DOCUMENTS.md b/microservices/LocationsApi/DOCUMENTS.md
index 5f08a25..6e146e5 100644
--- a/microservices/LocationsApi/DOCUMENTS.md
+++ b/microservices/LocationsApi/DOCUMENTS.md
@@ -21,6 +21,14 @@ Inbound JSON documents
   }
   ```
   `coord` cannot be updated.
+- ResetWorldRequest (`POST /api/locations/reset-world`)
+  ```json
+  {
+    "confirmDeleteAllNonOriginLocations": true,
+    "confirmationPhrase": "RESET WORLD TO ORIGIN"
+  }
+  ```
+  Both fields are required for the request to be accepted.
 - GatherResourceRequest (`POST /api/locations/{id}/gather`)
   ```json
   {
@@ -63,3 +71,40 @@ Outbound JSON documents
     "inventoryResponseJson": "string (raw InventoryApi response JSON)"
   }
   ```
+- ResetWorldResponse (`POST /api/locations/reset-world`)
+  ```json
+  {
+    "deletedLocationCount": 42,
+    "remainingLocationCount": 2,
+    "movedCharacterCount": 5,
+    "reassignedInventoryItemCount": 19,
+    "origin": {
+      "id": "string (ObjectId)",
+      "name": "Origin",
+      "coord": {
+        "x": 0,
+        "y": 0
+      },
+      "biomeKey": "plains",
+      "elevation": 0,
+      "resources": [],
+      "locationObject": null,
+      "locationObjectResolved": true,
+      "createdUtc": "string (ISO-8601 datetime)"
+    },
+    "limbo": {
+      "id": "string (ObjectId)",
+      "name": "World Limbo",
+      "coord": {
+        "x": -2000000000,
+        "y": -2000000000
+      },
+      "biomeKey": "plains",
+      "elevation": 0,
+      "resources": [],
+      "locationObject": null,
+      "locationObjectResolved": true,
+      "createdUtc": "string (ISO-8601 datetime)"
+    }
+  }
+  ```
diff --git a/microservices/LocationsApi/Models/ResetWorldRequest.cs b/microservices/LocationsApi/Models/ResetWorldRequest.cs
new file mode 100644
index 0000000..01aeff0
--- /dev/null
+++ b/microservices/LocationsApi/Models/ResetWorldRequest.cs
@@ -0,0 +1,8 @@
+namespace LocationsApi.Models;
+
+public class ResetWorldRequest
+{
+    public bool ConfirmDeleteAllNonOriginLocations { get; set; }
+
+    public string ConfirmationPhrase { get; set; } = string.Empty;
+}
diff --git a/microservices/LocationsApi/Models/ResetWorldResponse.cs b/microservices/LocationsApi/Models/ResetWorldResponse.cs
new file mode 100644
index 0000000..550cce6
--- /dev/null
+++ b/microservices/LocationsApi/Models/ResetWorldResponse.cs
@@ -0,0 +1,16 @@
+namespace LocationsApi.Models;
+
+public class ResetWorldResponse
+{
+    public int DeletedLocationCount { get; set; }
+
+    public int RemainingLocationCount { get; set; }
+
+    public int MovedCharacterCount { get; set; }
+
+    public int ReassignedInventoryItemCount { get; set; }
+
+    public required Location Origin { get; set; }
+
+    public required Location Limbo { get; set; }
+}
diff --git a/microservices/LocationsApi/README.md b/microservices/LocationsApi/README.md
index cdbde9a..b138b57 100644
--- a/microservices/LocationsApi/README.md
+++ b/microservices/LocationsApi/README.md
@@ -5,6 +5,7 @@ See `DOCUMENTS.md` for request payloads and stored document shapes.
 
 ## Endpoints
 - `POST /api/locations` Create a location with a unique coord pair (SUPER only).
+- `POST /api/locations/reset-world` Move all characters to origin, move floor inventory from reset locations into a hidden limbo location, then recreate the world with a fresh origin tile plus that limbo location. Requires an explicit confirmation request body (SUPER only).
 - `GET /api/locations` List all locations (SUPER only).
 - `DELETE /api/locations/{id}` Delete a location (SUPER only).
 - `PUT /api/locations/{id}` Update a location name (SUPER only).
diff --git a/microservices/LocationsApi/Services/LocationStore.cs b/microservices/LocationsApi/Services/LocationStore.cs
index 9d474e3..4c06a63 100644
--- a/microservices/LocationsApi/Services/LocationStore.cs
+++ b/microservices/LocationsApi/Services/LocationStore.cs
@@ -11,6 +11,9 @@ public class LocationStore
     private readonly IMongoCollection<CharacterDocument> _characters;
     private readonly IMongoCollection<BiomeDefinition> _biomeDefinitions;
     private const string CoordIndexName = "coord_x_1_coord_y_1";
+    private const string LimboLocationName = "World Limbo";
+    private const int LimboCoordX = -2000000000;
+    private const int LimboCoordY = -2000000000;
 
     public LocationStore(IConfiguration cfg)
     {
@@ -339,6 +342,60 @@ public class LocationStore
         return hasUpper || (hasLower && !(keyDoc.Contains("coord.x") && keyDoc.Contains("coord.y")));
     }
 
+    public async Task<Location> EnsureLimboLocationAsync()
+    {
+        var filter = Builders<Location>.Filter.And(
+            Builders<Location>.Filter.Eq(location => location.Coord.X, LimboCoordX),
+            Builders<Location>.Filter.Eq(location => location.Coord.Y, LimboCoordY));
+        var existing = await _col.Find(filter).FirstOrDefaultAsync();
+        if (existing is not null)
+            return existing;
+
+        var biomeDefinitions = await LoadBiomeDefinitionsAsync();
+        var limbo = BuildLimboLocation(biomeDefinitions);
+        try
+        {
+            await _col.InsertOneAsync(limbo);
+            return limbo;
+        }
+        catch (MongoWriteException ex) when (ex.WriteError.Category == ServerErrorCategory.DuplicateKey)
+        {
+            return await _col.Find(filter).FirstOrDefaultAsync()
+                ?? throw new InvalidOperationException("Limbo location was created concurrently but could not be reloaded.");
+        }
+    }
+
+    public async Task<List<string>> GetLocationIdsForWorldResetAsync(string preservedLocationId)
+    {
+        var filter = Builders<Location>.Filter.Ne(location => location.Id, preservedLocationId);
+        var locations = await _col.Find(filter).ToListAsync();
+        return locations
+            .Where(location => !string.IsNullOrWhiteSpace(location.Id))
+            .Select(location => location.Id!)
+            .ToList();
+    }
+
+    public async Task<ResetWorldResponse> ResetWorldToOriginAsync(string preservedLocationId)
+    {
+        var biomeDefinitions = await LoadBiomeDefinitionsAsync();
+        var deleteFilter = Builders<Location>.Filter.Ne(location => location.Id, preservedLocationId);
+        var deleteResult = await _col.DeleteManyAsync(deleteFilter);
+
+        var origin = BuildOriginLocation(biomeDefinitions);
+        await _col.InsertOneAsync(origin);
+        var limbo = await _col.Find(location => location.Id == preservedLocationId).FirstOrDefaultAsync()
+            ?? throw new InvalidOperationException("Limbo location missing after world reset.");
+        var remainingLocationCount = await _col.CountDocumentsAsync(Builders<Location>.Filter.Empty);
+
+        return new ResetWorldResponse
+        {
+            DeletedLocationCount = (int)deleteResult.DeletedCount,
+            RemainingLocationCount = (int)remainingLocationCount,
+            Origin = origin,
+            Limbo = limbo
+        };
+    }
+
     private void EnsureOriginLocation()
     {
         var biomeDefinitions = LoadBiomeDefinitions();
@@ -356,21 +413,12 @@ public class LocationStore
         if (existing is not null)
             return;
 
-        var origin = new Location
+        var origin = BuildOriginLocation(biomeDefinitions, originBiomeKey);
+
+        try
         {
-            Name = "Origin",
-            Coord = new Coord { X = 0, Y = 0 },
-            BiomeKey = originBiomeKey,
-            Elevation = 0,
-            LocationObject = CreateLocationObjectForBiome(biomeDefinitions, originBiomeKey, 0, 0),
-            LocationObjectResolved = true,
-            CreatedUtc = DateTime.UtcNow
-        };
-
-        try
-        {
-            _col.InsertOne(origin);
-        }
+            _col.InsertOne(origin);
+        }
         catch (MongoWriteException ex) when (ex.WriteError.Category == ServerErrorCategory.DuplicateKey)
         {
             // Another instance seeded it first.
@@ -461,6 +509,44 @@ public class LocationStore
         }
     }
 
+    private static Location BuildOriginLocation(IReadOnlyList<BiomeDefinition> biomeDefinitions, string? originBiomeKey = null)
+    {
+        var resolvedOriginBiomeKey = string.IsNullOrWhiteSpace(originBiomeKey)
+            ? biomeDefinitions.Any(definition => definition.BiomeKey == "plains")
+                ? "plains"
+                : biomeDefinitions[0].BiomeKey
+            : originBiomeKey;
+
+        return new Location
+        {
+            Name = "Origin",
+            Coord = new Coord { X = 0, Y = 0 },
+            BiomeKey = resolvedOriginBiomeKey,
+            Elevation = 0,
+            LocationObject = CreateLocationObjectForBiome(biomeDefinitions, resolvedOriginBiomeKey, 0, 0),
+            LocationObjectResolved = true,
+            CreatedUtc = DateTime.UtcNow
+        };
+    }
+
+    private static Location BuildLimboLocation(IReadOnlyList<BiomeDefinition> biomeDefinitions)
+    {
+        var limboBiomeKey = biomeDefinitions.Any(definition => definition.BiomeKey == "plains")
+            ? "plains"
+            : biomeDefinitions[0].BiomeKey;
+
+        return new Location
+        {
+            Name = LimboLocationName,
+            Coord = new Coord { X = LimboCoordX, Y = LimboCoordY },
+            BiomeKey = limboBiomeKey,
+            Elevation = 0,
+            LocationObject = null,
+            LocationObjectResolved = true,
+            CreatedUtc = DateTime.UtcNow
+        };
+    }
+
     private async Task<Location> EnsureLocationMetadataAsync(Location location)
     {
         var locationId = location.Id ?? string.Empty;