Chiang Mai Province of approximately . The mountains of the Daen Lao Range () at the north end of the province, the Thanon Thong Chai Range () stretching in a north-south direction, and the Khun Tan Range in the east of the province are covered by rain forest. The Mae Ping, one of the major tributaries of the Chao Phraya River, originates in the Daen Lao mountains. The highest mountain in Thailand, Doi Inthanon at , is in Chiang Mai Province. Several other national parks are also in the province: Doi Suthep-Pui, Ob Luang, Sri Lanna, Huai Nam Dang, Mae Wang, and Pha
Doi Tung to the princess mother's interest and encouragement, the hills were reforested. She was also instrumental in fighting against the opium trade. As a result the local hill tribes stopped growing poppies and began to grow other crops. The royal villa was originally built as a summer residence for the princess mother and now houses a museum and displaying her work to improve the life quality of local tribal people. The Mae Fah Luang Gardens are a botanical park on the slopes below the royal villa. Flowers and plants grow among rock formations. Doi Tung Doi Tung (ดอยตุง) is a mountain