Hallingdalsvassdraget
Hallingdalsvassdraget is the name of a river system in Norway . It is part of the Drammenvassdraget and covers an area of 5,237 km². The main river is the Hallingdalselva , which has a length of 220 km. The Hallingdalselva river has its source in the western parts of the Hardangervidda and flows east, later in a southerly direction through the Hallingdal . The river flows into Lake Krøderen and is called Snarumelva from the outflow from Lake . This then flows into the Drammen river near Geithus (Modum municipality) .