This would be a perfectly ordinary neighbourhood of Berlin or perhaps neighbouring Potsdam visible only on maps that show the border between Berlin and Potsdam if not for its history. While the Berlin border during German partition included a number of enclaves and exclaves, this is the only place where a significant number (some 300 people) ended up on an "island" of West Berlin surrounded by East German territory. Some complicated corridor solutions were applied for people from Steinstücken to be able to get to West Berlin proper without the need for lengthy border formalities. These days, like before partition, people in Steinstücken tend to use the services of Potsdam more than those of Berlin on a day-to-day basis.

Steinstücken (German: [ˈʃtaɪnʃtʏkn̩] ; lit. 'Stone Pieces'), with approximately 300 residents, is a small outlying neighborhood of the Wannsee district in the Berlin borough of Steglitz-Zehlendorf. From the division of Germany in 1949 until a connecting corridor was created in 1971–72, Steinstücken was the only permanently inhabited of twelve original exclaves of West Berlin in East Germany, while West Berlin itself was an enclave controlled by the Western Allies, surrounded by East German (GDR) territory.