This county is situated between the Tjornes peninsula and Oxafiordur County.  Its inhabited area, between the lava edge and the sea, contains many natural phenomena worth seeing, such as the National Park Jokulsargljufur, the canyon Asbyrgi, and a myriad of recent faults, rifts and dislocations of the earth's crust, created during the tectonic period 1975-84.  During the winter of 1975-76 this area was hit by several earthquakes, which altered the landscapes and caused great structural damage to most of the houses of the village Kopasker.  The so-called Earthquake Lake, 9 km², was created at the time.  Two fault systems cross the Kelduhverfi County, the Theistareykir system and the Krafla system.  The latter contains the lava field “Kerlingarholshraun”, which contains the greatest number of lava caves in the country, among them the largest one in the North.

Road no. 85 crosses the area from west to east.  Before entering it from the west, a mound called “Imbuthufa” offers an excellent panoramic view over the whole area on a fine day.  The area east of the glacial river Jokulsa is called Oxarfiord.  Just east of the bridge (1957) is a crossing.  Road 864 continues to the south to the Dettifoss waterfall and eventually to the farm Grimsstadir and the main road around the country.  Just south of the bridge in the Kelduhverfi County is the beginning of the 25 km long Jokulsa Canyons, which extend to the waterfall Selfoss, just one kilometre south of waterfall Dettifoss.  The third national park of the country, Jokulsargljufur, was established in 1973 (120 km²) and stretches along the whole length of the western side of the canyons.