The Highlands of Iceland cover most of the interior of the
island.
They are situated above 400–500 metres and are mostly an
uninhabitable volcanic desert,
because the water precipitating as rain or snow infiltrates
so quickly into the ground that it is unavailable for plant
growth.
This results largely in a surface of grey, black or brown earth, lava
and volcanic ashes.
Most of the numerous glaciers, such as Vatnajökull,
Langjökull and Hofsjökull, are also part of the
Icelandic
Highlands