Stp.Gr. was one of the smallest groups of defensive locations.  Just six locations with heavy pillboxes were planned with a total of about 35 pillboxes with walls and roofs of over two meters thick. Twenty-one of these were constructed.  Six others were partly constructed, but not ready for use at the end of the war.
 
 

Baupunkt 50 (Battr. Callantsoog) Of this battery some small fortifications are still remaining. Also a pillbox for an anti-armour-gun is left. Landfront Shows some trenches on the inland side of the stp.gr.