The Agulhas current is a warm current located in the southwestern ocean and flows along the east coast of Africa form 27 to 40° S. It has a source lies in eastern Madagascar current and follows the continental shields. Large cyclic meanders called natal pulses are formed by the current when it reaches the continental shelf.
It happens because the consuming is higher than the water drop rate, or even because there are too many people in a zone where there is not enough fresh water.