What is "grasvatnet"

Gresvatnet or Grasvatnet is a lake on the border between Norway and Sweden. Most of the lake lies in the municipality of Hemnes in Nordland county (Norway) and then a small portion crosses the border into Storuman Municipality in Västerbotten county (Sweden). The lake lies about east of the village of Korgen, and just a few kilometres northeast of the mountain Oksskolten and the Okstindbreen glacier.