|Surface area||42.88 km²|
The lake stretches about 41 kilometers (25 mi) north from the village of Krøderen in Krødsherad on its southern end and reaches north to the village of Gulsvik in Flå municipality in the valley of Hallingdal. The lake has a surface area of 42.88 km² and a depth of 119 meters. The primary river flowing into it is Hallingdalselva to the north. Its outlet is via the Snarumselva at the south end of the lake. Snarumselva flows into the Drammen River by Geithus in Modum.
At Noresund, along Norwegian National Road 7 (Rv7), there is a bridge over the lake. Krøderen is only about 200 meters (660 ft) wide at a point. Sole Hotel (Sole Hotell Krodsherad) is located along the national road between Krøderfjorden and Norefjell. Sole Hotel was originally a former doctor's home dating back to the beginning of the 1900s. In 1966, the facility opened as Norway's first conference hotel.
The Ols Norse form of the name must have been *Krœðir. This name is probably derived from the verb kryda 'stream/press together' related to Old English crudan 'to press, push'. In that case the name is probably referring to the narrow strait of Noresund.
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