diff --git a/django/contrib/gis/forms/widgets.py b/django/contrib/gis/forms/widgets.py
index 49ca48794b..55895ae9f3 100644
--- a/django/contrib/gis/forms/widgets.py
+++ b/django/contrib/gis/forms/widgets.py
@@ -1,5 +1,4 @@
 import logging
-import warnings
 
 from django.conf import settings
 from django.contrib.gis import gdal
@@ -7,7 +6,6 @@ from django.contrib.gis.geometry import json_regex
 from django.contrib.gis.geos import GEOSException, GEOSGeometry
 from django.forms.widgets import Widget
 from django.utils import translation
-from django.utils.deprecation import RemovedInDjango51Warning
 
 logger = logging.getLogger("django.contrib.gis")
 
@@ -20,8 +18,6 @@ class BaseGeometryWidget(Widget):
 
     geom_type = "GEOMETRY"
     map_srid = 4326
-    map_width = 600  # RemovedInDjango51Warning
-    map_height = 400  # RemovedInDjango51Warning
     display_raw = False
 
     supports_3d = False
@@ -29,19 +25,8 @@ class BaseGeometryWidget(Widget):
 
     def __init__(self, attrs=None):
         self.attrs = {}
-        for key in ("geom_type", "map_srid", "map_width", "map_height", "display_raw"):
+        for key in ("geom_type", "map_srid", "display_raw"):
             self.attrs[key] = getattr(self, key)
-        if (
-            (attrs and ("map_width" in attrs or "map_height" in attrs))
-            or self.map_width != 600
-            or self.map_height != 400
-        ):
-            warnings.warn(
-                "The map_height and map_width widget attributes are deprecated. Please "
-                "use CSS to size map widgets.",
-                category=RemovedInDjango51Warning,
-                stacklevel=2,
-            )
         if attrs:
             self.attrs.update(attrs)
 
diff --git a/django/contrib/gis/static/gis/js/OLMapWidget.js b/django/contrib/gis/static/gis/js/OLMapWidget.js
index b750327409..f3025f24ac 100644
--- a/django/contrib/gis/static/gis/js/OLMapWidget.js
+++ b/django/contrib/gis/static/gis/js/OLMapWidget.js
@@ -62,11 +62,6 @@ class MapWidget {
             this.options.base_layer = new ol.layer.Tile({source: new ol.source.OSM()});
         }
 
-        // RemovedInDjango51Warning: when the deprecation ends, remove setting
-        // width/height (3 lines below).
-        const mapContainer = document.getElementById(this.options.map_id);
-        mapContainer.style.width = `${mapContainer.dataset.width}px`;
-        mapContainer.style.height = `${mapContainer.dataset.height}px`;
         this.map = this.createMap();
         this.featureCollection = new ol.Collection();
         this.featureOverlay = new ol.layer.Vector({
diff --git a/django/contrib/gis/templates/gis/openlayers.html b/django/contrib/gis/templates/gis/openlayers.html
index 2849813c6e..f9f7e5fa51 100644
--- a/django/contrib/gis/templates/gis/openlayers.html
+++ b/django/contrib/gis/templates/gis/openlayers.html
@@ -1,8 +1,7 @@
 {% load i18n l10n %}
 
 <div id="{{ id }}_div_map" class="dj_map_wrapper">
-    {# RemovedInDjango51Warning: when the deprecation ends, remove data-width and data-height attributes. #}
-    <div id="{{ id }}_map" class="dj_map" data-width="{{ map_width }}" data-height="{{ map_height }}"></div>
+    <div id="{{ id }}_map" class="dj_map"></div>
     {% if not disabled %}<span class="clear_features"><a href="">{% translate "Delete all Features" %}</a></span>{% endif %}
     {% if display_raw %}<p>{% translate "Debugging window (serialized value)" %}</p>{% endif %}
     <textarea id="{{ id }}" class="vSerializedField required" cols="150" rows="10" name="{{ name }}"
diff --git a/docs/ref/contrib/gis/forms-api.txt b/docs/ref/contrib/gis/forms-api.txt
index 11e1bc77f4..61308c5933 100644
--- a/docs/ref/contrib/gis/forms-api.txt
+++ b/docs/ref/contrib/gis/forms-api.txt
@@ -101,16 +101,6 @@ from other Django widget attributes.
 
     The OpenGIS geometry type, generally set by the form field.
 
-.. attribute:: BaseGeometryWidget.map_height
-.. attribute:: BaseGeometryWidget.map_width
-
-    Height and width of the widget map (default is 400x600).
-
-    .. deprecated:: 4.2
-
-        ``map_height`` and ``map_width`` attributes are deprecated, use CSS to
-        size map widgets instead.
-
 .. attribute:: BaseGeometryWidget.map_srid
 
     SRID code used by the map (default is 4326).
diff --git a/docs/releases/5.1.txt b/docs/releases/5.1.txt
index d4510d30db..a1825a7954 100644
--- a/docs/releases/5.1.txt
+++ b/docs/releases/5.1.txt
@@ -267,3 +267,6 @@ to remove usage of these features.
   support in historical migrations.
 
 * The ``django.contrib.postgres.fields.CIText`` mixin is removed.
+
+* The ``map_width`` and ``map_height`` attributes of ``BaseGeometryWidget`` are
+  removed.
diff --git a/tests/gis_tests/test_geoforms.py b/tests/gis_tests/test_geoforms.py
index b8105645bf..c351edaaad 100644
--- a/tests/gis_tests/test_geoforms.py
+++ b/tests/gis_tests/test_geoforms.py
@@ -5,7 +5,6 @@ from django.contrib.gis.forms import BaseGeometryWidget, OpenLayersWidget
 from django.contrib.gis.geos import GEOSGeometry
 from django.core.exceptions import ValidationError
 from django.test import SimpleTestCase, override_settings
-from django.utils.deprecation import RemovedInDjango51Warning
 from django.utils.html import escape
 
 
@@ -445,9 +444,7 @@ class GeometryWidgetTests(SimpleTestCase):
                     "is_hidden": False,
                     "attrs": {
                         "map_srid": 4326,
-                        "map_width": 600,
                         "geom_type": "GEOMETRY",
-                        "map_height": 400,
                         "display_raw": False,
                     },
                     "name": "name",
@@ -486,19 +483,3 @@ class GeometryWidgetTests(SimpleTestCase):
         form = PointForm(data={"p": point.json})
         self.assertTrue(form.is_valid())
         self.assertEqual(form.cleaned_data["p"].srid, 4326)
-
-    def test_deprecated_width_and_height(self):
-        class CustomGeometryWidget(forms.BaseGeometryWidget):
-            map_height = 300
-            map_width = 550
-
-        msg = (
-            "The map_height and map_width widget attributes are deprecated. Please use "
-            "CSS to size map widgets."
-        )
-        with self.assertRaisesMessage(RemovedInDjango51Warning, msg):
-            CustomGeometryWidget()
-        with self.assertRaisesMessage(RemovedInDjango51Warning, msg):
-            forms.BaseGeometryWidget({"map_width": 400})
-        with self.assertRaisesMessage(RemovedInDjango51Warning, msg):
-            forms.BaseGeometryWidget({"map_height": 600})