Setesdal (older name: Sætersdal) is a valley and a traditional district in Aust-Agder County in southern Norway. It consists of the municipalities of Bykle, Valle, Bygland, Iveland, and Evje og Hornnes.The Otra river flows through the valley of Setesdal into the sea near Kristiansand. Setesdal flows from the Hardangervidda plateau in Telemark to the north. The historic Setesdal starts at Evje and extends as far as the farm called Bjåen, at the edge of Telemark county.