STEndpoint (geometry Data Type)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns the end point of a geometry instance.
Syntax
.STEndPoint ( )
Return Types
SQL Server return type: geometry
CLR return type: SqlGeometry
Open Geospatial Consortium (OGC) type: Point
Remarks
STEndPoint() is the equivalent of STPointN (x.NumPoints()).
This method returns null if called on an empty geometry instance.
Examples
The following example creates a LineString instance with STGeomFromText() and uses STEndpoint() to retrieve the end point of the LineString.
DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 1 0)', 0);
SELECT @g.STEndPoint().ToString();