What is "hornindalsvatnet"

Hornindalsvatnet is Norway's and Europe's deepest lake, officially measured to a depth of . Its surface is above sea level, which means that its bottom is below sea level. The village of Grodås lies at the eastern end of the lake in Hornindal Municipality and the village of Mogrenda is located on the western end of the lake in Eid Municipality. The European route E39 highway runs near the lake. The village of Heggjabygda and Heggjabygda Church lie on the northern shore of the lake.

Its volume is estimated at , its area is and ranks 19th in area among Norway's lakes. It is located in Sogn og Fjordane county, about a kilometer south of the county border with Møre og Romsdal county. The lake lies within the borders of Eid and Hornindal municipalities. The main outflow is the river Eidselva, which flows into the Eidsfjorden, an arm off the main Nordfjorden.

The lake is also the site of the Hornindalsvatnet Marathon, held annually in July.