Straumsetervatnet (or Selavatnet) is a lake on the border of the municipalities of Åfjord in Sør-Trøndelag county and Verran in Nord-Trøndelag county, Norway. The majority of the 4.72-square-kilometre (1.82 sq mi) lake lies in Verran, with the northwestern end of the lake partially lying in Åfjord. The village of Sela (and Sela Church) lies on the northern side of the lake and the village of Sandsetra at the southeastern end of the lake.