Op Luang National Park woodpecker, pheasant and partridge. Op Luang National Park Op Luang National Park () is a national park in Chiang Mai Province, Thailand. It is home to a scenic river canyon, waterfalls, and caves. Op Luang National Park is about south of Chiang Mai in Chom Thong, Mae Chaem and Hot Districts. The park's area is . It is contiguous with Doi Inthanon National Park. Like Doi Inthanon Park, Op Luang is in the Thanon Thong Chai Range. Prehistoric paintings and other artefacts have been found in Op Luang National Park. The Doi Pha Chang area has a cliff painting of
Doi Kham be reduced to ashes. Also, the number of people growing opium poppies was increasing. At the king's command, the royal project was created to provide alternative sources of income for hill tribe villages that formerly relied on opium production and swidden agriculture. The meaning of the words "Doi Kham" comes from two northern Thai words. The word "doi" means 'mountain' or 'hill' while the word "kham" is a shortened word for "thongkham" which means 'gold'. The Royal Project Foundation operates four research stations and thirty-five development centres that work with 295 villages containing 14,109 families. Involved are approximately 85,000 rural