Doi Inthanon is the highest peak of the Inthanon Range (Thai: ทิวเขาอินทนนท์) of the Thanon Thong Chai Range, a subrange of the Shan Hills in the Thai highlands stretching southwards from the Daen Lao Range. This range, the southwesternmost of the Shan Highland system, separates the Salween watershed from the Mekong watershed. Other high peaks of the Daen Lao Range are Doi Luang Chiang Dao (2,175 metres (7,136 ft)), Doi Pui (1,685 metres (5,528 ft)), and Doi Suthep (1,601 metres (5,253 ft)).
In 1954, the forests around Doi Inthanon were conserved, creating Doi Inthanon National Park, as one of the original 14 national parks of Thailand.3 This park now covers 482.4 km2 and spreads from the lowlands at 800 metres (2,625 ft) elevation up to the peak at 2,565 metres (8,415 ft). Given the varied climatic and ecological areas regions, the park supports a range of animal species, including over 360 bird species.
On the lower slopes of Doi Inthanon, near the Karen hill tribe village, Ban Sop Had, are the Wachirathan waterfalls (Thai: น้ำตกวชิรธาร), where the Wachirathan (lit. "Diamond Creek") tumbles over a granite escarpment. (18°32′30″N 98°35′57″E / 18.541790°N 98.599247°E / 18.541790; 98.599247)
The climate is typically tropical and fairly cool on the summit of Doi Inthanon. In the winter, the average temperature is 6 °C (43 °F) in January and temperatures can sometimes drop below 0 °C (32 °F). On 21 December 2017, an all-time low temperature of −5 °C (23 °F) was recorded at 06:30 at km 44.4.4 From March to June, temperatures are pleasant, especially at higher altitudes. The rainy season runs from April to November when it sometimes rains for more than two hours daily.
Geologically the mountain is a granite batholith in a north–south oriented mountain range. The second-highest peak of this range is Doi Hua Mot Luang at 2,340 metres (7,677 ft).
In 2014, visitors to the mountain left behind 36 tonnes (35 long tons; 40 short tons) of rubbish.5
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"Doi Inthanon Observatory sees 'unprecedented' negative 5C temperature". The Nation. 22 December 2017. Archived from the original on 22 December 2017. Retrieved 22 December 2017. https://www.nationthailand.com/detail/breakingnews/30334468 ↩
Sereemongkonpol, Pornchai (15 September 2017). "How to Boost Thai Tourism". Editorial. Bangkok Post. Retrieved 16 September 2017. http://www.bangkokpost.com/opinion/opinion/1324795/how-to-boost-thai-tourism ↩
"Doi Inthanon National Park". Tourism Authority of Thailand (TAT). Archived from the original on 16 September 2017. Retrieved 16 September 2017. https://web.archive.org/web/20170916140107/https://www.tourismthailand.org/Attraction/Doi-Inthanon-National-Park--153 ↩
"Doi Inthanon". Tourism Authority of Thailand (TAT). Archived from the original on 16 September 2017. Retrieved 16 September 2017. https://web.archive.org/web/20170916095721/https://www.tourismthailand.org/Doi-Inthanon ↩