Young Dassanech woman portrait. The Dassanech tribe lives in the semi-arid area around the Lower Omo Valley and the northern shore of Lake Turkana. The Dassanech are made up of eight roughly co-residential territorial groups According to oral tradition, many of these groups are the descendants of migrants who came to the Omo from various directions to escape such problems as famine and conflict and who thereby constructed ‘Dassanech’ society.