Ger?uberg (transcribed Gerduberg) is a cliff of dolerite, a coarse-grained basalt rock, located on western peninsula Sn?fellsnes and on the western edge of the Hnappadalur valley, 46 km in the north of the town of Borgarnes and 115 km to Reykjav?k.
Ger?uberg 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