The Valleys of Thieves are situated between the second largest glacier, Langjokull and the free standing, ice covered Mt. Hrutafell.  The name is derived from a few thieves, who hid there from justice in the past.

The valleys are almost closed at their mouth by the low Mt. Thverfell.  They are discharged by River Thjofadalaa, which spills into River Fulakvisl.  A mountain track for 4wd vehicles lies all the way to the tourist hut (built in 1939), which accommodates 10-12 people.  This track is accessible from the geothermal Hveravellir area, where there are two tourist huts and a weather observation station.  The Thjofadalir hut is a link on the hiking route across the Kjolur area.