The river is first named Nean at the eastern end of the artificial lake Sylsjön, which lies in Åre Municipality and Berg Municipality, Sweden. Below the dam, the river flows for 6 kilometres (3.7 mi), crossing the Swedish-Norwegian border where the name becomes Nea, before entering the lake Nesjøen. On the downstream side of the lake, the river continues through the smaller lake Vessingsjøen before continuing on its westward course. At the municipal center of Ås the river Tya joins it. After that, it follows the Tydalen valley and meets the river Rotla about 15 kilometres (9.3 mi) east of Mebonden where it ends when it flows into the lake Selbusjøen.