This lava field is about 4000 years old, likely from an eruption of nearby Grábrok and Grábrókafell craters (which are just visible to the north). A third volcanic crater has been mined for road bed and building materials and isn’t visible any longer. A lovely view over the lava field can be found from the top of Grábrók.
Grábrökarhraun is a very rough lava field, although softened somewhat by the covering of moss, heather, and even a few small shrubby willow trees. It is the quick-cooling Aa form of lava — rough and cindery and sharp, despite the softening layer of moss. There are a few paths into the lava, but this is a protected area.
The Glanni waterfall and Paradis Glen are both a short walk into the lava field.