The peat bogs on Toska have been mined for peat since 1946, when the island got electricity. In this treeless coastal landscape, peat was the most important source of energy, and this took quite a toll on the bogs.
Between Lake Kvalheimsvatnet and Lake Mykingsvatnet, north of Grindheim, we find one of the biggest continuous lowland bogs in Hordaland. It is 500-600 metres across and a whole 2 kilometres long. Locally, the bog is called "Havet" .