The partial map below(right) shows farms in the Alstaette Germany area as they were in 1842. This reprint was published 1995. The original is in the "Staatsbibliothek (state library) in Berlin". This card was drawn by a Prussian officer by hand and illustrated the exact cartographic location of  "Münsterland" in 1842. Thank you to Karl Shulte for scanning the reprint and sending it to us. 
The partial map of the area North of Alstaette (above right) shows the location of the farm on which Heinrich Gerwing lived. The farm was located North of Alstaette adjacent to the Netherlands border as shown.The map on the left shows that Heinrich lived in NW Germany.
Current Day Map of Munster Alstaette area
Approximate Distances:
Alstaette to Munster  60 km
Alstaette to Dortmund  120 km
Alstaette to Germany-Netherlands border 2.5 km

Home Page - Gerwing Family Tree