Utøya is an island in the Tyrifjorden lake in Hole municipality, in the county of Buskerud, Norway. The island is 10.6 hectares, situated 500 metres off the shore, by the E16 road, about 20 km driving distance south of Hønefoss, and 38 km northwest of Oslo city centre. The 2011 Utøya mass shooting took place on the island.