The uninhabited interior of Iceland is among the very few relatively easily accessible such areas left in the world. Its border is roughly drawn along the 400 m elevation and within that frame we have about 80% of the total area of the country. It consist mainly of moraines, sanded areas, lava fields, lakes and glaciers. The green pearls or the vegetated oases are only to be found where there is sufficient water. The landscapes are very varied and beautiful. It is recommended to use 4wd vehicles because of the various and changing condition of the tracks and unbridged rivers, which have to be forded with the greatest of care.