Doi Inthanon is a high mountain pass located in Mae Chaem District, Chiang Mai Province, part of the Himalayan mountain range. At an elevation of 2,565 m (8,415 ft) above the sea level, it’s the highest mountain in Thailand.
The road to reach the pass, called 1009, is asphalted. The summit of Doi Inthanon is a popular tourist destination for both foreign and Thai tourists. There are eight waterfalls that dive off the mountain. Nam Tok Mae Klang (at Km8) is the largest and the easiest to get to. Nam Tok Wachiratan (at Km20.8) is another popular stop with food vendors at its base and a huge frothy mane that plummets 50m.
The weather on this zone is harsh and highly unpredictable. As you drive up the winding road to the top it will become steadily cooler. At the top you can walk around and check out the sights there. There is a shop for souvenirs and also for drinks and snacks. (also toilets). Keep in mind that in the wet season, there is near-perpetual cloud there, so you can see little.
Starting from Mae Chaem, at an elevation of 653m above the sea level, the ascent is 22.1 km long. Over this distance, the elevation gain is 1904 heightmeters. The average percentage is 8.6 %.