Nations that are primarily desert, or which have particularly arid climates, tend not to have rivers, or are unable to sustain permanent rivers year round.
Of these, Saudi Arabia is by far the largest in terms of area.
Saudi Arabia is the biggest nation in the world without a river. It is also the only country with both the Persian Gulf and the Red Sea coasts.
A considerable part of Saudi Arabia is made up of mountains, lowlands, and arid desert. Even though Saudi Arabia does not have permanent rivers, it has several wadis.
How does the country get its water?
In a country that rarely sees rain, the habit of draining groundwater, like the Berain factory does, could prove perilous: groundwater makes up an estimated 98% of naturally occurring fresh water in Saudi Arabia
Today about 50% of drinking water comes from desalination, 40% from the mining of non-renewable groundwater and only 10% from surface water in the mountainous southwest of the country.