The extinct volcano at Chew Bet in southern Ethiopia has a dark, seasonal lake at the bottom of its deep, steep-sided crater. Borana tribesmen harvest salt there for their livestock. They use long poles to pry clods of salt-enriched inky ooze from the lakebed, occasionally submerging themselves to gather it in their arms. The salt is then transported to the crater rim in donkey panniers.The pastoral Borana live either side of the southern Ethiopian/northern Kenya border and form a large and important group of the Oromo-speaking cluster of tribes.