The Wiang Kosai National Park is about 70 kilometres from the provincial town in Wang Chin district. It can be reached by taking Highway No. 11 (Phrae-Lampang). Then take a left turn toward Wang Chin district and continue for a further 13 kilometres to reach the turn to the park headquarters.
A further 1.5 kilometres onwards are two waterfalls, the Mae Koeng Luang, one kilometer from the headquarters, and the Mae Koeng Noi, 2 kilometres on foot further on. Streams from the falls flow into the Yom River.