This destroyed the prosperity of Nisibis, and the district, no longer protected against nomad tribes, became a wilderness.
Agriculture does not exist; the reindeer constitutes the principal wealth of the nomad Samoyedes and Lapps.
The nomad Arabs are of two classes, camel owners (Slat El Ilbil) and cattle owners (Baggara), the first-named dwelling in the dry northern regions, the Baggara in southern Kordofan.
From the wells of Shakik he crossed the waterless Nafud in four days to Jubba, and after a halt there in the nomad camps, he moved on to Hail, already a thriving town, and the capital of the Shammar state whose limits included all northern Arabia from Kasim to the Syrian border.
Shammar and Tema, there are numerous wells and artificial as well as natural reservoirs resorted to by the nomad tribes.