Phou Hi Poun National Bio-Diversity Area, Khammouan, Laos - This is just one of the amazing lakes we visited on our two day hike through the Phou Hi Poun National Bio-Diversity Area. Half on the lake is an open area the rest is inside a cave. Because of the limestone the lake has a bright blue color. We didn’t Photoshop this picture at all. #Laos #trekking #lake