The history of early settlement of the East African coast is currently interpreted in widely differing ways. One view takes as its premise the idea that the coast was first colonized from Asia. This hypothesis, which has its roots in the work of XlXth century historians suggests that there was substantial settlement by non-Africans who established trading and religious communities. These colonies formed the basis of what has come to be known as the Swahili Culture. At first defensible peninsulas and offshore islands were chosen as safe refuges from the African tribes of the interior. Eventually contact was established between these new communities and the African coastal peoples, to the benefit of both parties. Raw materials were obtained from the hinterland of these trading outposts, which were traded and taken across the Western Indian Ocean on the seasonal monsoons. The foreign merchants married local African women and an Afro-Arab culture developed, building stone towns, mosques, and tombs, that still remain today along the coastline from Somalia to Mozambique.