The plateau is the largest peneplain in Europe, covering an area of about at an average elevation of. The highest point on the plateau is at the top of the Hardangerjøkulen glacier, which reaches a height of. The landscape of the Hardangervidda is characterised by barren, treeless moorland interrupted by numerous pools, lakes, rivers and streams. There are significant differences between the west side, which is dominated by rocky terrain and expanses of bare rock, and the east side, which is much flatter and more heavily vegetated. The climate also varies between the two sides: it is considerably wetter on the west side than on the east, with over per year recorded in some parts. The prominent peak of Hårteigen is visible across much of the plateau. Much of the Hardangervidda's geology is extremely ancient. The rolling fells of the Hardangervidda are the remnants of mountains that were worn down by the action of glaciers during the ice ages. The bedrock is mainly of Precambrian and Cambro-Silurian origin.
Flora and fauna
The whole of the Hardangervidda is above the tree line. Its alpine climate enables the presence of many species of arctic animals and plants further south than anywhere else in Europe. Its wild reindeer herds are among the largest in the world, with some 15,000 animals recorded in 1996 and around 8,000 in 2008. They migrate across the plateau during the year, moving from their winter grazing lands on the east side of the Hardangervidda, where they graze on lichen, to their breeding grounds in the more fertile west of the plateau. The varying climate of the plateau has a marked effect on the flora, which is richer on the wetter west side than in the drier east; much of the plateau is covered by coarse grasses, mosses and lichens. In the Holocene climatic optimum 9000 – 5000 years ago, the regional climate was warmer, and large parts of Hardangervidda were wooded; pine logs can still be found preserved in bogs well above today's treeline. With the predicted warming, Hardangervidda could again be largely wooded.
The Hardangervidda has been occupied for thousands of years; several hundred nomadic Stone Age settlements have been found in the area, most likely related to the migration of the reindeer. Ancient trails cross the plateau, linking western and eastern Norway. One example is the "Nordmannsslepa" linking Eidfjord and Veggli in the Numedal valley with Hol and Uvdal. It is still a key transit route between Oslo and Bergen. The Bergen Line and the main Highway 7 cross the plateau.
Activities
Hardangervidda is accessible all year round. June/July to September/October is great for hiking, fishing, wildlife viewing, cycling, horseback riding, canoeing, hunting and other summer activities. Hiking is the easiest and best way to experience Hardangervidda national park. The Norwegian Trekking Association offers a network of hiking paths and cabins connecting Hardangervidda from Haukeliseter and Mogen in the south to Finse in the north, Rjukan and Geilo in the east and Eidfjord and Odda in the west.
Accidents
At night on 26 August 2016, 323 wild reindeers, including 70 calves, were killed by lightning during a storm, when they stood in the grasses of the Hardangervidda plateau.
In filming
Part of the second episode of The Future is Wild was filmed here.