Class 
Description 
Bounds

A Bounds is an Envelope with a Projection. 
CircularRing

A CircularRing is a closed CircularString. 
CircularString

A CircularString is a collection of connected circular arc segments. 
CompoundCurve

A CompoundCurve is a connected set of CircularStrings and LineStrings 
CompoundRing

A CompoundRing is a connected set of CircularStrings and LineStrings 
Geometry

The base class for other Geometries. 
GeometryCollection

A GeometryCollection is a heterogenerous collection of other Geometries. 
LineString

A LineString Geometry. 
LinearRing

A LinearRing Geometry is a LineString whose first and last coordinates are the same forming a closed ring. 
MultiLineString

A MultiLineString Geometry. 
MultiPoint

A MultiPoint Geometry. 
MultiPolygon

A MultiPolygon Geometry. 
Point

A Point Geometry. 
Polygon

A Polygon Geometry. 
PreparedGeometry

A PreparedGeometry makes repeated spatial operations more efficient. 