The Brazilian population of more evident black physiognomy is more strongly present along the coast, due to the high concentration of slaves working on sugar cane plantations. Another region that had a strong presence of Africans was the mining areas in the center of Brazil. Freyre wrote that the states with strongest African presence were Bahia and Minas Gerais, but that there is no region in Brazil where the black people have not penetrated. Many blacks fled to the hinterland of Brazil, including the Northern region, and met Amerindian and Mameluco populations. Many of these acculturated blacks were accepted in these communities and taught them the Portuguese language and the European culture. In these areas the blacks were "agents for transmitting European culture" to those isolated communities in Brazil. Many blacks mixed with the Amerindian and caboclo women.