What is "halensee"

Halensee is a locality (Ortsteil) of Berlin in the district (Bezirk) of Charlottenburg-Wilmersdorf. Until 2004 the former neighbourhood established about 1880 was part of the Wilmersdorf locality, and until 2001 of the same-named former borough. With an area of 1.27 km² it is the smallest locality of the city after the Hansaviertel.