The easternmost point is represented by Springeberg, a ground located in front of Flakensee lake, bordering with Woltersdorf and Erkner, two municipalities of the Oder-Spree district, Brandenburg.

Similar to an exclave it is linked to Berliner mainland with a road (Woltersdorfer Landstraße) forming a strip, as in Steinstücken.

Another peculiarity of Rahnsdorfer borders with Brandenburg is represented by Landjägerallee, a road parallel to the railway that forms a thin and long strip belonging to Erkner surrounded by Berliner territory.

Between the Müggelspree river, an affluent of the Spree representing the border shared with Müggelheim, and the old town, it is located Neu-Venedig (New Venice), a residential settlement so named because it is crossed by numerous artificial canals.

The second, not operated by BVG and separated from the citizen network, connects Rahnsdorf station to Woltersdorf.