diff --git a/movement/roi/base.py b/movement/roi/base.py
index d46d29b1..f924ff88 100644
--- a/movement/roi/base.py
+++ b/movement/roi/base.py
@@ -39,11 +39,10 @@ class BaseRegionOfInterest:
     instantiated, however its primary purpose is to reduce code duplication.
     """
 
-    __default_name: str = "Un-named"
-    __supported_type: TypeAlias = SupportedGeometry
+    __default_name: str = "Un-named region"
 
     _name: str | None
-    _shapely_geometry: __supported_type
+    _shapely_geometry: SupportedGeometry
 
     @property
     def coords(self) -> CoordinateSequence:
@@ -85,7 +84,7 @@ def name(self) -> str:
         return self._name if self._name else self.__default_name
 
     @property
-    def region(self) -> __supported_type:
+    def region(self) -> SupportedGeometry:
         """``shapely.Geometry`` representation of the region."""
         return self._shapely_geometry
 
@@ -139,15 +138,14 @@ def __init__(
                 ValueError,
                 "Cannot create a loop from a single line segment.",
             )
-        self._shapely_geometry = (
-            shapely.Polygon(shell=points, holes=holes)
-            if dimensions == 2
-            else (
+        if dimensions == 2:
+            self._shapely_geometry = shapely.Polygon(shell=points, holes=holes)
+        else:
+            self._shapely_geometry = (
                 shapely.LinearRing(coordinates=points)
                 if closed
                 else shapely.LineString(coordinates=points)
             )
-        )
 
     def __repr__(self) -> str:  # noqa: D105
         return str(self)
diff --git a/movement/roi/line.py b/movement/roi/line.py
index c82b35a8..54de20a7 100644
--- a/movement/roi/line.py
+++ b/movement/roi/line.py
@@ -1,8 +1,6 @@
 """1-dimensional lines of interest."""
 
-from typing import TypeAlias
-
-from movement.roi.base import BaseRegionOfInterest, LineLike, PointLikeList
+from movement.roi.base import BaseRegionOfInterest, PointLikeList
 
 
 class LineOfInterest(BaseRegionOfInterest):
@@ -22,9 +20,6 @@ class LineOfInterest(BaseRegionOfInterest):
     pairs of points, to form the LoI that is to be studied.
     """
 
-    __default_name: str = "Un-named line"
-    __supported_type: TypeAlias = LineLike
-
     def __init__(
         self,
         points: PointLikeList,
diff --git a/movement/roi/polygon.py b/movement/roi/polygon.py
index fcd0bac0..0154f0e5 100644
--- a/movement/roi/polygon.py
+++ b/movement/roi/polygon.py
@@ -1,9 +1,8 @@
 """2-dimensional regions of interest."""
 
 from collections.abc import Sequence
-from typing import TypeAlias
 
-from movement.roi.base import BaseRegionOfInterest, PointLikeList, RegionLike
+from movement.roi.base import BaseRegionOfInterest, PointLikeList
 from movement.roi.line import LineOfInterest
 
 
@@ -23,9 +22,6 @@ class PolygonOfInterest(BaseRegionOfInterest):
     (closed) ``LineOfInterest``, and may be treated accordingly.
     """
 
-    __default_name: str = "Un-named polygon"
-    __supported_type: TypeAlias = RegionLike
-
     def __init__(
         self,
         boundary: PointLikeList,
diff --git a/tests/test_unit/test_roi/test_instantiate.py b/tests/test_unit/test_roi/test_instantiate.py
index 7e4758eb..4d8f7cb1 100644
--- a/tests/test_unit/test_roi/test_instantiate.py
+++ b/tests/test_unit/test_roi/test_instantiate.py
@@ -14,7 +14,7 @@
         pytest.param(
             "unit_square_pts",
             {"dimensions": 2, "closed": False},
-            {"is_closed": True, "dimensions": 2, "name": "Un-named"},
+            {"is_closed": True, "dimensions": 2, "name": "Un-named region"},
             id="Polygon, closed is ignored",
         ),
         pytest.param(
@@ -59,6 +59,15 @@
             ValueError("Cannot create a loop from a single line segment."),
             id="Cannot close single line segment.",
         ),
+        pytest.param(
+            "unit_square_pts",
+            {"dimensions": 3, "closed": False},
+            ValueError(
+                "Only regions of interest of dimension 1 or 2 "
+                "are supported (requested 3)"
+            ),
+            id="Bad dimensionality",
+        ),
     ],
 )
 def test_creation(
@@ -82,10 +91,18 @@ def test_creation(
         expected_closure = kwargs_for_creation.pop("closed", False)
         if expected_dim == 2:
             assert isinstance(roi.region, shapely.Polygon)
+            assert len(roi.coords) == len(input_pts) + 1
+            string_should_contain = "-gon"
         elif expected_closure:
             assert isinstance(roi.region, shapely.LinearRing)
+            assert len(roi.coords) == len(input_pts) + 1
+            string_should_contain = "line segment(s)"
         else:
             assert isinstance(roi.region, shapely.LineString)
+            assert len(roi.coords) == len(input_pts)
+            string_should_contain = "line segment(s)"
+        assert string_should_contain in roi.__str__()
+        assert string_should_contain in roi.__repr__()
 
         for attribute_name, expected_value in expected_results.items():
             assert getattr(roi, attribute_name) == expected_value