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bei Feldberg-Ort, Baden-Württemberg (Deutschland)
Hike around the Feldsee cirque, a tarn that was formed by glaciers of the last Ice Age.
The Feldsee (also Feldbergsee) is a lake at the foot of the Feldberg. It is part of the Southern Black Forest Nature Park. The Feldsee is a tarn up to 32 metres deep. It was formed by glaciers of the last Ice Age. A tarn (or corrie loch) is a mountain lake or pool, formed in a cirque excavated by a glacier. It is formed when either rain or river water fills the cirque. A moraine may form a natural dam below a tarn. The Seebach stream, which rises between the Feldberg and Seebuck in the Grüble, flows through the Feldsee, tumbling over the Feldsee Waterfall on the wall of the cirque, eventually becoming the Gutach at the far side of the Titisee. For several hundred thousand years this was the upper course of the ancient Danube (Urdonau), which flowed into the present-day Danube near Immendingen and, for the last several ten thousand years has formed a headstream of the Wutach, which flows into the Rhine.