The Callerbach dam, also called Seiler Lake, is one of the ten dams in the Märkisch district and offers recreational fun for young and old alike. As a local recreation area, the surrounding area offers rowing, pedal boating, mini-golf, swimming in the newly built sports and brine pool or in the outdoor pool Schleddenhof as well as ice skating fun at in the ice rink. Many people come here to take walks on it well-kept paths around the lake or a short hike to the Bismarck Tower. The leisure offer is rounded off by tennis courts, a sports field and a half pipe. In addition, 200 km of hiking trails are available in the city forest!
The Callerbach dam (Seiler Lake) was originally built to secure the water supply for the nearby sewage treatment plant. Construction began in 1913 and was officially christened as a dam on 10 June 1914. The Seiler Lake is approx. 16 hectares large, holds up to 500 000 m3 of water and has a 160 m long dam. For Iserlohn, the lake is of great importance as a local recreation area. Especially families with children and older people enjoy the walking paths around Seiler Lake.
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