STStartPoint (geography Data Type)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns the start point of a geography instance.
Syntax
.STStartPoint ( )
Return Types
SQL Server return type: geography
CLR return type: SqlGeography
Open Geospatial Consortium (OGC) type: Point
Remarks
STStartPoint() is the equivalent of STPointN(1).
Examples
The following example creates a LineString instance and uses STStartPoint() to retrieve the start point of the instance.
DECLARE @g geography;
SET @g = geography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656)', 4326);
SELECT @g.STStartPoint().ToString();