Trölladyngja

Situated in the Ódáðahraun lava field, Trölladyngja is the biggest of the Icelandic shield volcanoes, reaching a height of 1,460 metres above sea level, and rising almost 600 m above the surrounding desert and lava fields. It part of the Bárðarbunga volcanic system and has a volume of 15 km3 with some extensive lava flows to the north of Bárðarbunga.

It is about 10 kmin diameter and its inclination is 4 to 5° in the lower slopes, but 6 to 8° at higher elevations. Its oblong crater is about 1,200 to 1,500 m in length, 500 m broad, and about 100 m deep.

Source: Wikipedia