Marbachstausee, Reservoir in Beerfelden, Odenwaldkreis district, Germany.

Marbachstausee is a reservoir in the Odenwald region with a large water surface ringed by dense forest. The water body has designated swimming areas and is surrounded by marked walking paths.

The Marbach dam was built between 1978 and 1982 by the Wasserverband Mümling as an earth-and-rockfill embankment with an asphalt concrete facing. Its main purpose was flood protection for the villages downstream, where the Marbach could easily exceed the Mümling's discharge capacity after rain or snowmelt. The entire dam system cost 31 million DM and was officially inaugurated in 1985 after testing. Since 1986 the reservoir has also been officially designated for recreation.

Locals use the reservoir as a gathering place for outdoor activities and walks along the water. In warmer months, residents come here to spend time in nature and enjoy the open landscape.

The site is accessible year-round with parking areas and visitor facilities available throughout. Well-marked trails make it easy to explore on foot whether you prefer a short walk or a longer hike.

The reservoir's surface is divided west to east into three zones: a bird protection area with a nature island (though not officially protected), a swimming area with beach, lawn and bathing islands, and a sailing and surfing zone for boats up to 3.5 m² of sail. The southern Meisengrund bay holds a youth campsite and a DLRG water rescue station.