In East Africa the monsoon leads to two rain seasons in the equatorial area, the so-called long rains in March-May and the short rains in October-November when the ITCZ moves northward and southward over the region, respectively; in addition to the Indian Ocean-sourced precipitation there is also Atlantic- and Congo-sourced precipitation west of the Congo Air Boundary. In Arabia, the monsoon does not penetrate far from the Arabian Sea and some areas are under the influence of winter precipitation brought by cyclones from the Mediterranean Sea. East Africa is also under the influence of monsoon circulations.