The Schwentine Oxbow Lake (German: Altarm der Schwentine) is an area around part of the River Schwentine between Raisdorf and Klausdorf that was designated a nature reserve in 1984. It received this conservation status because the waterbody has remained close to its natural state due to its steep river banks and is a habitat for a range of rare plants and animals. It covers an area of 19 hectares (47 acres).