Eastern gedo, including both sides of the river is originally Reewing territory. Towns like Luuq, Bardhere, Burdhubo etc were founded and originally settled by them.
Reewing have nothing to do with Western Gedo tho. That land has in recent history belonged to samaale and marehan with the latter displacing the former gradually over the years and finishing the job in 91. Before the war Gedo was home to Garre, Hawadle, Badicade, Murule, Ajuran, Gaaljecel etc who have all since been evicted from the region