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The Mathisleweiher is a large bog lake, under 2 hectares in area, in the Black Forest in southern Germany. It lies in the High Black Forest between Feldberg in the west and the Titisee in the east on the territory of Hinterzarten at about southwest of the village in the Eschengrundmoos Nature Reserve. The pond impounds the Zartenbach which flows through it from west-southwest to east-northeast. The stream rises on the eastern slopes of the Ramselehöhe () at about , picks up the Eschengrundmoosbach from the right from the protected bog and runs for less than a kilometre before entering the lake. A shorter stream runs from the north from the woods of the Stuckwald. It has a catchment of 1.0 km2
The lake is accessible from Hinterzarten but only on foot. A path runs from the village passing close to the lake and a spur branches off to the east shore.
Together with the Mathislehof, Mathislemühle and Mathislewald the pond belongs to the Müller-Fahnenberg Foundation of the University of Freiburg.
Origin of the name The Mathisleweiher s named after the nearby farm of Mathislehof, which in turn is named after the farmer, Mathias Rombach, who inherited the farm in 1736 by marrying the widow.
References LUBW Official online waterbody map with extract and layers used here: General access without presets and layers: Seefläche: Lake area from the layer: Stehende Gewässer. Dimensionen: Length and width measured on the background layer Topographische Karte. Höhe: Height based on black writing on the background layer Topographische Karte. Height based on the contour image on the background layer Topographische Karte. EZG: Catchment measured from the background layer Topographische Karte.
Special references Verordnung des Regierungspräsidiums Freiburg als höhere Naturschutzbehörde über das Naturschutzgebiet »Eschengrundmoos« dated 4 December 1984 (GBl. dated 28 December 1984, p. 705). Online: http://www2.lubw.baden-wuerttemberg.de/public/abt2/dokablage/oac_12/vo/3/3140.htm Digital topographic map 1:10,000 series (DTK 10), Landesamt für Geoinformation und Landentwicklung Baden-Württemberg. URL: http://www.geoportal-bw.de/geoportal/opencms/de/geoviewer.html
Klaus Weber: Chronik der Eschbacher Höfe. In: Breisgauer Nachrichten vom 29. Juli 1954. Abschrift unter http://www.stegen-dreisamtal.de/chronesch.htm Günther Reichelt: Geographische Landesaufnahme: The natural regional units on Sheet 185 Freiburg i. Br. Bundesanstalt für Landeskunde, Bad Godesberg, 1964. → Online-Karte (pdf; 3.7 MB)
External links
at: Map of the Mathisleweiher and area with footpaths and cycleways at: