Below a south facing, steep rock at Årsand, there is one of the strangest ancient relics in the whole of Hordaland. The jutting rock wall forms a shallow flagstone – Geithilderen. Parts of the rock wall are covered by a light lime crust and on the crust figures have been painted in golden and rusty red colours.
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”.