Ottadalen (English: Otta Valley) is a valley in the municipalities of Skjåk, Lom, Vågå, and Sel in Innlandet county, Norway.
The Otta River flows through the valley. The Otta River begins in the municipality of Skjåk and flows into lake Vågåvatnet. Exiting Vågåvatnet at Vågåmo, it continues its journey through the valley, leaving the municipality of Vågå to meet the Gudbrandsdalslågen river at the town of Otta in Sel Municipality.
Gudbrandsdalen (Urban East Norwegian: [ˈɡʉ̂ː(d)brɑnsˌdɑːɳ]; English: Gudbrand Valley) is a valley and traditional district in the Norwegian county of Innlandet (formerly Oppland county). The valley is oriented in a north-westerly direction from Lillehammer and the lake of Mjøsa, extending 230 kilometers (140 mi) toward the Romsdalen valley. The river Gudbrandsdalslågen (Lågen) flows through the valley, starting from the lake Lesjaskogsvatnet and ending at the lake Mjøsa. The Otta river which flows through Otta valley is a major tributary to the main river Lågen. The valleys of the tributary rivers such as Otta and Gausa (Gausdal) are usually regarded as part of Gudbrandsdalen. The total area of the valley is calculated from the areas of the related municipalities. Gudbrandsdalen is the main valley in a web of smaller valleys. On the western (right hand) side there are long adjacent valleys: Ottadalen stretches 100 kilometers (62 mi) from Otta village, Gausdal some 50 kilometers (31 mi) from Lillehammer and Heidal some 40 kilometers (25 mi) from Sjoa. Gudbrandsdalen runs between the major mountain ranges of Norway including Jotunheimen and Dovrefjell–Rondane.
Together with the Glomma river and the Østerdalen valley, the river Lågen and the Gudbrandsdalen valley form Norway's largest drainage system covering major parts of Eastern Norway. Gudbrandsdalen is home to Dovre Line railway and the European route E6 highway. The valley is the main land transport corridor through Eastern Norway, from Oslo and central eastern lowlands to Trondheim and Møre og Romsdal.
Reinheimen National Park (Norwegian: Reinheimen nasjonalpark) is a national park in Norway that was established in 2006. The park consists of a 1,969-square-kilometre (760 sq mi) continuous protected mountain area. It is located in Møre og Romsdal and Innlandet counties in Norway. The park includes parts of the municipalities of Lesja, Skjåk, Vågå, Lom, Fjord, and Rauma. The park consists of much of the Tafjordfjella mountain range as well as the reindeer habitat in the northern part of the Ottadalen valley.
The park is one of the largest wilderness areas still intact in Western Norway. Much of the original alpine ecosystem, including wild reindeer, wolverines, golden eagles, gyr falcons, and ptarmigans, is still intact. The park is made up of numerous mountains and valleys. The highest mountains in the park tower are more than 2,000 metres (6,600 ft) above sea level. The landscape in Reinheimen is extremely varied. In the west, it is very dramatic, with sharply pointed peaks and knife-edge ridges, and rapidly flowing rivers. Towards the east, the terrain is more gently sloping, plateaus occur, valleys are broader and rivers flow more slowly. A number of rivers, such as the Istra, Rauma, Lora, Finna/Skjerva, Valldøla, and Tora/Føysa, have their sources in Reinheimen.
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.