a locality in southwestern Berlin: site of two lakes, the Großer Wannsee and the Kleiner Wannsee; scene of the Wannsee Conference (1942), at which senior SS officials, including Heydrich and Eichmann, agreed on a plan to murder European Jews in camps in Nazi-occupied Poland; the building in which the conference was held is now a memorial and museum. Pop: 9,044 (2008)