is a scenic waterfall about 20 kilometres to the north of the district town of Chiang Kham on Highway No. 1093. The surroundings are still in perfect natural condition. Phu Sang is different than other waterfalls. It is fed by a hot spring on the mountain which flows into the brook before cascading over the fall.
Five kilometres from Phu Sang waterfall is a village on the Thai Laotian border. On the 10th and 30th of every month, Ban Huak village hold a bazaar for Thais and Laotians to trade and barter their products.