Reiårsfossen is a high waterfall in the Aust-Agder area and the Setesdalen valley. The water for it springs a few hundred metres higher up in the Store Reiårsvatnet lake. Almost right next to the waterfall is the parking lot on road number 9 and ironically the best views of Reiårsfossen are either from this parking lot or even better from the other side of the Otra River. The approach to the bottom of the waterfall is quite muddy in places and you can count on a lot of mosquitoes.