What is "sverka"

Sverka is a small river in the municipality of Namdalseid in Nord-Trøndelag county, Norway. It flows from the lakes called Finnvollvatnet and Furudalsvatnet northeast past the Sverkmoen area to the lake Øyungen. At Øyungen, it joins the river Øyensåa which continues until it joins with the Ferja. There, it becomes the river Årgårdselva which flows to the Namsenfjorden. There is good salmon fishing in the lower parts of the river. The river system is about long.