Somalia, situated in the Horn of Africa, illustrates the devastating effects of lack of political centralization. Somalia has been dominated historically by people organized into six clan families. The four largest of these, the Dir, Darod, Isaq, and Hawiye, all trace their ancestry back to a mythical ancestor, Samaale. These clan families originated in the north of Somalia and gradually spread south and east, and are even today primarily pastoral people who migrate with their flocks of goats, sheep, and camels. In the south, the Digil and the Rahanweyn, sedentary agriculturalists, make up the last two of the clan families.