They are Hmong and Khmu village one hour's journey from Luang Prabang (travel by car or tuk-tuk). This village is located in a beautiful valley is the starting point for a three hour trek that finishes at the Kuangsi waterfall. Local guides are available to lead you to the falls (note they speak only Lao). You can also begin a longer five hour trek to Kuangsi Waterfall from Ban Nong Heo, which has a spectacular view over the valley and river. Ban Nong Heo is 20 minutes from town by tuk-tuk.