7 Step Waterfall is a waterfall in Ratanakiri Province, during the dry season with the surrounding covered by green forest and rock mountain. 7 Step waterfall has 4 steps and the height of each floor is 4 meters.Most of the people in Rattanakiri Province also rename 7 step waterfall to Ou'Sean Lair and there are many place which you can traveling for whole day such as mountain, lakes, wildlife with the nature of northeastern Ratanakiri Province.