sentences:  While the Kel Owey pastoralised in the region, visiting towns and their plantations irregularly, Aouderas developed a small but unusual sedentary population of Tuareg cultivators.Barth also described this valley as the southernmost instance of plow agriculture, though he witnessed the local servile population pulling the plows in place of farm animals.Despite dire social conditions for the sedentary population and frequent raids from rival Tels and Toubu pastoralists, the sedentary Ikelan had built a large fertile island in the Aïr.