Otta is a river in Innlandet county, Norway. The 147.85-kilometre (91.87 mi) river flows through the Ottadalen valley which includes the municipalities of Skjåk, Lom, Vågå, and Sel. The watershed of the Otta drains an area of 4,172 square kilometres (1,611 sq mi) beginning in the Breheimen mountains and emptying into the large river Gudbrandsdalslågen. The Otta River is known for rafting. The rafting season begins in mid-May and lasts until the end of September. The Norwegian National Road 15 runs along the river for almost its entire course.[1][2]
The name of the river is probably derived from the Old Norse verb ótta which means to "scare" or "terrify". The water of the river comes from glaciers, and the flooding of the river can be strong and fierce.