Rotla is a 40 kilometres (24.9 mi) long river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in Trøndelag

Trøndelag

Trøndelag is the name of a geographical region in the central part of Norway, consisting of the two counties Nord-Trøndelag and Sør-Trøndelag. The region is, together with Møre og Romsdal, part of a larger...

, Norway. The river begins at Roltdalstjønna in Meråker

Meråker

Meråker is a municipality in Nord-Trøndelag county, Norway. It is part of the Stjørdalen region. The administrative centre of the municipality is the village of Midtbygda which is about west of Storlien in Sweden and east of Stjørdalshalsen in Stjørdal. Other villages in Meråker include Gudåa,...

 in Nord-Trøndelag

Nord-Trøndelag

is a county constituting the northern part of Trøndelag in Norway. As of 2010, the county had 131,555 inhabitants, making it the country's fourth-least populated county. The largest municipalities are Stjørdal, Steinkjer—the county seat, Levanger, Namsos and Verdal, all with between 21,000 and...

 county, just north of the mountain Fongen

Fongen

Fongen is a mountain on the border of the municipalities of Selbu , Tydal , and Meråker in Norway...

. It then runs through west through the Skarvan and Roltdalen National Park. The river ends when it flows into the Nea River

Nea River

The Nea River is an long river which runs through the municipalities of Tydal and Selbu in Sør-Trøndelag county, Norway. The river Nea is a part of the Nea-Nidelvvassdraget watershed...

 near Stokkan in Selbu

Selbu

Selbu is a municipality in Sør-Trøndelag county, Norway. The administrative centre of the municipality is the village of Mebonden. Other villages in Selbu include Flora, Fossan, Hyttbakken, Innbygda, Selbustrand, Tømra, and Vikvarvet.-General information:...

 in Sør-Trøndelag

Sør-Trøndelag

- References :...

 county. The Nea River then flows west for 15 kilometres (9.3 mi) until reaching the lake Selbusjøen at Mebonden

Mebonden

Mebonden is a village that is the administrative centre of the municipality of Selbu in Sør-Trøndelag county, Norway. It is located at the eastern end of the lake Selbusjøen at the mouth of the Nea River....

. The river Rotla is part of the Nea-Nidelvvassdraget

Nea-Nidelvvassdraget

Nea-Nidelvvassdraget is a watercourse in the municipalities of Tydal, Selbu, Klæbu, and Trondheim in Sør-Trøndelag county, Norway. The total area of the watershed is and it runs for about from the source in the Sylan mountains to its mouth in the Trondheimsfjorden...

 watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

.