Pha Daeng National Park, formerly known as Chiang Dao National Park, is a national park in Chiang Mai Province, Thailand. The park covers 702,085 rai ~ 1,123 square kilometres (434 sq mi) of the Pha Daeng mountain areas of the Daen Lao Range near the border with Burma, just north of Chiang Dao Wildlife Sanctuary. The tallest summit is 1,794 m high Doi Puk Phakka.