Twenty rai of Doi Mon Jong mountain in Chiang Mai province was turned to ash this week as a blaze tore through its forested flank.
Firefighters posted photographs of the mountain’s charred slopes, which draw thousands of hikers from across the country each year.
A once-lush green area covering the equivalent of three football fields now forms an ugly black gash in the landscape.
Doi Mon Jong, located in Amphur Om-Goi, is among the 10 highest peaks in the country, rising 1,929 metres above sea level.
It is also home to various wildlife, including wild elephants, serow and goral, a rare goat-like antelope species.