There are many small lakes next to Langisjór, this one in particular is called Austastalón. Langisjór is a lake in the Highlands of Iceland. It is around 20 km in length and up to 2 km wide, with a total surface area of about 26 km2 and a depth of 75m at its deepest point.

The lake is situated rather far from civilization at the south-western border of Vatnajökull at an altitude of 670 m above sea level. Environmental campaigners have expressed concern at government plans to site an industrial dam on the lake.

Mountains in the area, Mt.Fremri-Skoltur, Mt.Innri-Skoltur, Mt.Lambshöfði, Mt.Háskanef, Mt.Skálakambur, Mt.Kringla and of course the famous Mt.Sveinstindur in the distance. On the other side is Mt.Breiðbakur.

There is a small island located where the water exits Langisjór almost at the end called Padda. Where the water exits the lake in a small waterfall and is called Útfall and flows into the river Skaftá.

Beautiful Hálsar crater lakes are on the other side of river Skáftá.