Regen River

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Regen
The Regen near Lappersdorf.
The Regen near Lappersdorf.
Origin Bohemian Forest
Mouth Danube
Basin countries Germany, Czech Republic
Length 169 km
Avg. discharge 40 m³/s
Basin area 2,953 km²

The Regen (Czech: Řezná) is a river in Bavaria, Germany, left tributary of the Danube. The source of its main headstream, the Großer Regen ("Big Regen"), is located in the Bohemian Forest on the territory of the Czech Republic, near Železná Ruda. The river crosses the border after a few km, at Bayerisch Eisenstein.

At Zwiesel, the Großer Regen is joined by the Kleiner Regen ("Little Regen") to form the Schwarzer Regen ("Black Regen"). The Schwarzer Regen flows through Regen and Viechtach, and is joined by the Weißer Regen ("White Regen") in Kötzting. From this confluence, the river is called Regen.

The Regen Valley forms the main valley crossing the Bavarian Forest; many settlements within the mountains are located along the river. Cities along the Regen river include Cham and Regensburg. At Regensburg the river joins the Danube.

The river's total length, including its headstreams Großer Regen and Schwarzer Regen, is 169 km.

Coordinates: 49°00′29″N 13°01′24″E / 49.00806, 13.02333