Southeast along the coast from Djibouti is Somalia, but the Somali coast soon makes a 90-degree turn and heads northeast, mirroring a bend in the coast of Yemen across the water to the north and defining the south coast of the Gulf of Aden. The Somali coast then takes a hairpin turn back southwest to complete the horn of Africa. For six months of the year the monsoon winds blow from up equatorial Somalia, past Arabia and over the small Yemeni archipelago of Socotra, to rain on India; they then switch directions and blow back. Hence the east- and especially southeast-coast boundary of Arab Africa has historically been a gateway for maritime trade and cultural exchange with both East Africa and the subcontinent. The trade winds also help explain the presence of the Comoros islands, an Arab-African country, off the coast of Mozambique, near Madagascar in the Indian Ocean, the southernmost part of the Arab World.