Location Mae Hong Son province is approximately north of
Bangkok by road. To the north and west it connects to a total of three states in the
Union of Burma, namely the southern portion of
Shan State,
Kayah State, and
Kawthoolei State, via the
Dawna Range, and the
Salween and
Moei Rivers. These formations serve as natural boundaries between the countries. To the south, it borders the district of
Tha Song Yang and Tak, via the rivers
Yuam and
Ngao, which serve as a provincial boundary. To the east it borders the districts of
Wiang Haeng,
Chiang Dao,
Mae Taeng,
Mae Chaem,
Hot and
Omkoi in
Chiang Mai province, via the
central and
east sections of the
Thanon Thongchai mountain ranges, which serve as a boundary between the two provinces. Every district in
Mae Hong Son province shares a common border, measuring approximately 483 kilometres in total length, with
Myanmar. The common border consists of approximately of land boundary and of river boundary (not counting the
Salween, , and
Moei, ).
Topography Most of the areas of
Mae Hong Son province are the complex mountain ranges of the
Thai highlands, parts of which are still covered with
rainforest. The total forest area is or 85.5 percent of provincial area.
Climate Mae Hong Son province has a
tropical savanna climate (
Köppen climate classification category Aw). Winters are dry and warm. Temperatures rise until May.
Monsoon season runs from May through October, with heavy rain and somewhat cooler temperatures during the day, although nights remain warm. Temperature statistics: Its maximum temperature is 44.6 °C (112.3 °F) on 28 April 2016 and the lowest temperature is 3.9 °C (39.0 °F). The highest average temperature is 35.6 °C (96.1 °F) on 25 December 1999 and the minimum average temperature is 18.0 °C (64.4 °F). The average relative humidity is 96.99% and the minimum relative humidity is 20%. Annual rainfall is 1,064.9 millimeters and on 23 April 1968 was for 24 hour the rainfall 130.4 mm. The number of rainy days was 130 days for a year.
Weather box Mae Hong Son and
Weather box Mae Sariang National parks There are six national parks, with total area of , of which five in
region 16 (Mae Sariang branch) and Huai Nam Dang in
region 16 (Chiang Mai), they are the protected areas of Mae Hong Son province. (Visitors in fiscal year 2024)
Wildlife sanctuaries There are six wildlife sanctuaries, with a total area of , of which five in
region 16 (Mae Sariang branch) and Mae Lao-Mae Sae in
region 16 (Chiang Mai), they are the protected areas of Mae Hong Son province.
Location protected areas Water resources There are 31 water reservoirs with total capacity of 12.31 million cubic meters: • Huai So Tue, capacity 1,880,000 m3 • Huai Fai Kho, capacity 950,000 m3 • Huai Mae Hong Son, cap. 734,000 m3. • Huai Mae Salap, cap. 700,000 m3. There are 617 groundwater wells, which are used to mine groundwater for general use.
Mineral resources Among the minerals that have been discovered in the province are
limestone,
coal,
lignite,
lead,
zinc,
tin,
tungsten,
antimony,
fluoride, and
feldspar. The mineral area is approximately 2,440 km2 (19% of provincial area). One of those mines in Mae Hong Son province is the Samoeng mine. ==Administrative divisions==