Reykjanesfólkvangur Recreation Park was established in 1975 and is the largest one in Iceland, 300 km². It covers most of the uninhabited part of the Reykjanes peninsula in southwest Iceland. The only big lake in the park is Kleifarvatn which has no surface drainage and is one of the deepest lakes in Iceland, 97 m. Not far from its south shore lies Krísuvík geothermal area.

The area is mostly covered with mountains, mountain ridges and lava fields. The mountains are largely formed by volcanic eruptions under glaciers and the lava fields during modern times. The most well know of these is the Ögmundarhraun lava field which was formed during an eruption in the mid 12th century AD.

Búrfellsgjá is a lava channel formed when Búrfell crater erupted some 7.200 years ago. Búrfell crater is the closest one to the capital area which has erupted in modern times.