According to Icelandic legend, this half-man, half-troll is the namesake of the Snaefellsnes Peninsula. Arnarstapi also has several viewpoints. One of the best is Arnarstapi Cliff Viewpoint.

Iceland, which is roughly ... Earth’s crust and uppermost mantle), Troll explained, creating cracks that allow magma to come up. “The Reykjanes peninsula is exactly on this plate boundary ...