For almost three thousand years Tjernagelshaugen (the Tjernagel cairn) has lain as a landmark at the Bømlo fjord. The poet Torarin mentions the cairn in his account of Knut the Mighty, who in the year of 1028 sailed from Denmark to Nidaros: “And in front of the old cairn at Tjernagel sailed soldiers sharp with peace”.
Lake Bjellandsvatnet is one of the richest wetland areas in Sveio. But, everything has its limit, and the supply of nutrients can be too much. This is what was about to happen in Lake Bjellandsvatnet.