We are interested in the town of Shomova or Szumowo. On the left, two locations for the town, on opposite sides of Zambrow. Possibly one is pre-war and one post-war.
The left side is centered on Zambrow and shows both locations. The right side is centered on Bialystok and shows only one. We have the impression that Szumowo was close to Zambrow.
See the Shomova Line.