What is "erlensee"

Erlensee is a municipality in the Main-Kinzig district, in Hesse, Germany. It is situated on the river Kinzig, 5 km northeast of Hanau. It was formed in 1970 by the merger, in 1970, of the towns of Langendiebach and Rückingen. The name deduces from the abundant alders at the lakes (Erlen=alders, See=lake) in this area.