Bogensee is a small lake near Wandlitz in the German state of Brandenburg, located about 15 kilometres (9.3 mi) north of the Berlin city limits.The oval shaped lake, a relic of the last ice age, is located on the Barnim Plateau and part of the Barnim Nature Park. It covers an area of approximately 9,200 m2 (99,000 sq ft), and is 180 m (590 ft) in width (west to east) and 300 m (980 ft) in length (south to north).