In the extreme east is Vatnajokull, which is separated from Tungnafellsjokull by Vonarskard (3300 ft.).
It is highest on the tableland, on the north side of Vatnajokull, and lowest on the north-west peninsula, to the south of North Cape.
It is on the south side of Vatnajokull that they descend lowest; the lower end of Breidamerkurjokull was in the year 1894 only 30 ft.
The group of lakes called Fiskiviitn (or Veidivotn), which lie in a desolate region to the west of Vatnajokull, consist for the most part of crater lakes.
The largest unbroken lava-field in Iceland is Oda6ahraun (Lava of Evil Deeds), upon the tableland north from Vatnajokull (2000 to 4000 ft.