The Chaga (also called Wachaga, Chagga, Jagga, Dschagga, Waschagga, or Wachagga) are Bantu-speaking indigenous Africans and the third largest ethnic group in Tanzania. They traditionally live on the southern and eastern slopes of Mount Kilimanjaro and Mount Meru and near Moshi. Their relative wealth comes from the favorable climate of the area and successful agricultural methods, which include extensive irrigation systems, terracing, and continuous organic fertilization methods practiced for thousands of years. They were one of the first tribes in the area to convert to Christianity. This may have given them an economic advantage over other ethnic groups, as they had better access to education and health care as Christians. The Chagga descended from various Bantu groups who migrated from elsewhere in Africa to the foothills of Mount Kilimanjaro, a migration that began around the start of the eleventh century. While the Chagga are Bantu-speakers, their language has a number of dialects related to Kamba, which is spoken in northeast Kenya, and to other languages spoken in the east, such as Dabida and Pokomo. The Chagga area is traditionally divided into a number of chiefdoms. The Chagga are culturally related to the Pare, Taveta, and Taita peoples. The Chagga follow a patrilineal system of descent and inheritance. The Chagga way of life is based primarily on agriculture, using irrigation on terraced fields and oxen manure. Although bananas are their staple food, they also cultivate various crops, including yams, beans, and maize. In agricultural exports, the Chagga are best known for their Arabica coffee, which is exported to American and European markets, resulting in coffee being a primary cash crop.