Surbtal

Surbtal is the name of a river valley region in the Canton of Aargau in Switzerland.

The Surbtal (literally Surb valley) is situated parallel to the Limmat Valley (Limmattal) in the Baden and Zurzach districts of the Canton of Aargau in Switzerland. The valley is bounded by moraines of the Linth glacier; and in the east it passes over to the border of the Canton of Zürich respectively the drainage bassin of the Wehn Valley (native German name: Wehntal).

Surbtal comprises the area of the municipalities:

The Surb is a 20 kilometres (12.4 mi) long river in the Swiss cantons of Aargau and Zürich, where she rises on an altitude of 471 metres (1,545 ft) MAMSL at the municipality of Schöfflisdorf. The river drains the northern Wehntal, passing the municipalities of Ehrendingen, Lengnau, Endingen, Unterendingen and Tegerfelden in the Surbtal. South of the village center of Döttingen, the Surb joins the Aare.

About 185,000 years ago, a side lobe of the Walensee/Reinglacier overlapped on the threshold at the present Pfannenstiel eastern slope from Hombrechtikon into the Glatttal towards Niederweningen, and eroded the overdeepened rock rut of the present Wehntal area. After another glacier maximum about 140,000 years ago, the ice melted in the last Eemian (interglacial) period back far into the alpine valleys, and great lakes with border union fens filled the former glacial basin. Following the Würm glaciation, during the last glacial maximum about 24,000 years ago, the glaciers pushed again to the lower Glatt Valley. With the increasing warming period about 20,000 years ago, the glaciers melted away in stages to Zürich, later Hurden and formed the Seedamm at the Obersee lake shore respectively the Ufenau, Lützelau and Heilig Hüsli islands on Zürichsee, and finally the glaciers retreated into the alpine mountains.

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