Trolltunga (Troll's tongue) is a piece of rock jutting horizontally out of a mountain about 700 metres (2,300 ft) above the north side of the lake Ringedalsvatnet in the municipality of Odda in Hordaland county, Norway. The cliff is located east of the Skjeggedal area, about 10 kilometres (6.2 mi) east of the village of Tyssedal and the Sørfjorden (a branch off of the main Hardanger Fjord). The name translated to English is The Troll's tongue.
The cliff is part of the precambrian bedrock and was formed during the ice age, approximately 10,000 years ago, when the edges of the glacier reached the cliff. The water from the glacier froze in the crevices of the mountain and eventually broke off large, angular blocks, which were later carried away with the glacier. Along the cliff itself, a gneiss, there continues to be deep cracks. The trail to Trolltunga also passes through the bedrock and washed slippery hillsides in the background also containing gneiss.