Mt Thorbjor (Thorbjarnarfell) is a free standing, hyaloclastite mountain north of Grindavik. It offers great panoramic view over most of the Reykjanes Peninsula on fine days. The northeastern part of the mountain depicts thermal activity an to its north and northeast is an extensive high temperature area. It is split by a fissure called “The Thieves´ Gap” (Thjofagja), occupied by 15 thieves according to the legend. They were eventually overwhelmed and killed by trickery.