The arid tropics zone, extend between the semi-humid tropics
and the subtropical dry zone, mostly between 15 and 23° North and South. Some arid tropical areas reach closer to the equator, such as in Northeastern Brazil ("Nordeste") and East of Africa (Horn of Africa). These more equatorial arid zones are always situated in the eastern flank of large land masses, and do therefore receive very little moisture from the continental areas.
One well-known arid area is called Sahel zone
*), lying in Africa between the semi-humid tropical humid savanna
and the Sahara