The Grabrók crater was formed around 3000 years ago by the eruption of a crevasse. The original column was not particularly large, but strong enough to create Grabrók and its two sister craters, Rrauðbrók and Litla-Grabrok. Grabrók is the largest of the three craters and is located on the ring road, north of Lake Hreðavatn. It rises 170m above the ground and is one of the most famous landmarks in the region.
The crater is surrounded by the huge lava field Grábrók, which arose during the same eruption. It is seven square kilometers in size. The fact that the black lava is mainly covered with green moss and bushes gives it a special beauty. The crater itself is also heavily overgrown with moss. We also recommend going to the sources in the lava field. The largest and most visited is the Paradísarlaut spring, which is only a few kilometers east of Grábrók on the other side of the ring road.
The top of the crater can be reached quickly on foot from the parking lot. A path leads up, which has been simplified for walkers by artificially built steps. The impressive view extends from the most beautiful part of Brogarfjördur to the small lake Hreðarvatn, which was also created by the same eruption as the crater and its surroundings. In the northwest you can see the colorful mountain Baula.