diff --git a/maplibre/sources.py b/maplibre/sources.py
index adc0c9a2..3ab3b3f8 100644
--- a/maplibre/sources.py
+++ b/maplibre/sources.py
@@ -146,6 +146,10 @@ def __init__(self, data: GeoDataFrame | str, source_id: str = None):
         self._data = data
         self._source_id = source_id or str(uuid4())
 
+    @property
+    def crs(self):
+        return self._data.crs
+
     @property
     def bounds(self) -> tuple:
         return self._data.total_bounds
diff --git a/tests/test_sources.py b/tests/test_sources.py
index 838bd7cc..2b1d72ee 100644
--- a/tests/test_sources.py
+++ b/tests/test_sources.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from geopandas import GeoDataFrame, read_file
 from maplibre.sources import *
 
 
@@ -43,3 +44,16 @@ def test_vector_tile_source():
         "tiles": tiles,
         "type": "vector",
     }
+
+
+def test_simple_features():
+    # Prepare
+    path = "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_110m_admin_1_states_provinces_shp.geojson"
+
+    # Act
+    sf = SimpleFeatures(path)
+
+    # Assert
+    assert isinstance(sf.to_source(), GeoJSONSource)
+    assert sf.crs == "EPSG:4326"
+    assert len(sf.bounds) == 4