diff --git a/pytiled_parser/world.py b/pytiled_parser/world.py
index 64ddfed3..5cf70fb3 100644
--- a/pytiled_parser/world.py
+++ b/pytiled_parser/world.py
@@ -61,7 +61,7 @@ class World:
     only_show_adjacent: bool = False
 
 
-class RawPattern(TypedDict):
+class _RequiredPattern(TypedDict):
     regexp: str
     multiplierX: float
     multiplierY: float
@@ -69,6 +69,11 @@ class RawPattern(TypedDict):
     offsetY: float
 
 
+class RawPattern(_RequiredPattern, total=False):
+    mapWidth: float
+    mapHeight: float
+
+
 class RawWorldMap(TypedDict):
     fileName: str
     height: float
@@ -150,8 +155,8 @@ def parse_world(file: Path, encoding: str) -> World:
 
                     raw_world_map: RawWorldMap = {
                         "fileName": map_file,
-                        "width": width,
-                        "height": height,
+                        "width": raw_pattern.get("mapWidth", width),
+                        "height": raw_pattern.get("mapHeight", height),
                         "x": x,
                         "y": y,
                     }
diff --git a/tests/test_world_pattern_dimensions.py b/tests/test_world_pattern_dimensions.py
new file mode 100644
index 00000000..1ccec749
--- /dev/null
+++ b/tests/test_world_pattern_dimensions.py
@@ -0,0 +1,46 @@
+import json
+
+import pytest
+
+from pytiled_parser import parse_world
+from pytiled_parser.common_types import OrderedPair, Size
+
+
+@pytest.mark.parametrize(
+    "dimensions, expected",
+    [
+        ({}, Size(100, 200)),
+        ({"mapWidth": 80}, Size(80, 200)),
+        ({"mapHeight": 160}, Size(100, 160)),
+        ({"mapWidth": 80, "mapHeight": 160}, Size(80, 160)),
+        ({"mapWidth": 0}, Size(0, 200)),
+        ({"mapHeight": 0}, Size(100, 0)),
+    ],
+)
+def test_world_pattern_dimensions(tmp_path, dimensions, expected):
+    map_file = tmp_path / "map_-2_3.tmx"
+    map_file.touch()
+    (tmp_path / "unrelated.txt").touch()
+    pattern = {
+        "regexp": r"^map_(-?\d+)_(-?\d+)\.tmx$",
+        "multiplierX": 100,
+        "multiplierY": 200,
+        "offsetX": 7,
+        "offsetY": 11,
+    }
+    pattern.update(dimensions)
+    world_file = tmp_path / "maps.world"
+    world_data = {"patterns": [pattern], "type": "world"}
+    world_data["onlyShowAdjacentMaps"] = True
+    world_file.write_text(
+        json.dumps(world_data),
+        encoding="utf-8",
+    )
+
+    parsed = parse_world(world_file)
+    assert parsed.only_show_adjacent
+    assert len(parsed.maps) == 1
+    parsed_map = parsed.maps[0]
+    assert parsed_map.map_file == map_file
+    assert parsed_map.size == expected
+    assert parsed_map.coordinates == OrderedPair(-193, 611)