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The Mathisleweiher is a large
bog lake
A bog or bogland is a wetland that accumulates peat as a deposit of dead plant materials often mosses, typically sphagnum moss. It is one of the four main types of wetlands. Other names for bogs include mire, mosses, quagmire, and muskeg; ...
, under 2 hectares in area, in the
Black Forest
The Black Forest (german: Schwarzwald ) is a large forested mountain range in the state of Baden-Württemberg in southwest Germany, bounded by the Rhine Valley to the west and south and close to the borders with France and Switzerland. It is t ...
in southern
Germany
Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...
. It lies in the
High Black Forest
The High Black Forest (german: Hochschwarzwald) is a touristic and geographical region in the south-west of the German federal state Baden-Württemberg, primarily in the Southern Black Forest.
History of the name
The term ''Hochschwarzwald'' o ...
between
Feldberg in the west and the
Titisee
The Titisee is a lake in the southern Black Forest in Baden-Württemberg. It covers an area of and is an average of deep. It owes its formation to the Feldberg glacier, the moraines of which were formed in the Pleistocene epoch and nowadays for ...
in the east on the territory of
Hinterzarten
Hinterzarten is a resort village in the Black Forest (German: ''Schwarzwald''), located in the southwest of the state of Baden-Württemberg, Germany. Although Hinterzarten is mostly famous for its ski jumping, it has many other tourist attractions. ...
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
A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the ...
of 1.0 km