Arheilger Mühlchen, Bathing lake in Arheilgen, Darmstadt, Germany

The Arheilger Mühlchen is a bathing lake and cultural monument in Darmstadt with distinct sections for different needs. A shallow zone provides space for small children and families, while deeper sections and diving boards serve more experienced swimmers.

The bathing lake developed from a former mill site and became an important location for the community over the decades. After facing closure, the site was saved through local engagement and now continues under new stewardship.

The name comes from a grain mill that once stood nearby; the mill burned down in 1877, and the inn built soon after on the same spot closed in 2025. The lake was long called Unterer Arheilger Teich or Unterer Woog. Since 2012 the Förderverein Naturbadesee Arheilger Mühlchen has supported the site, and every July it hosts the Mühlchen-Triathlon.

The site has changing areas, showers, lockers, and toilets for visitors to use. A kiosk on the grounds offers drinks and light food options.

The water is treated without chlorine, making it an ecological alternative to traditional pools. Visitors appreciate this nature-based swimming experience in the region.