Gerðuberg (in Icelandic pronounced as /ˈcɛrðʏˌpɛrk/; also transcribed Gerduberg) is a cliff of dolerite, a coarse-grained basalt rock, located on western peninsula Snæfellsnes and on the western edge of the Hnappadalur in Icelandic pronounced as /ˈn̥ahpaˌtaːlʏr̥/ valley, 46 km in the north of the town of Borgarnes and 115 km to Reykjavík.[1]
Gerðuberg was formed from flowing basaltic lava, cooled by the sea, solidified in very evenly running columns. These are between 1 and 1.5 m wide and 7 to 14 m high.[2]