TheMyanmar–Thailand border is the international border between the territory ofMyanmar (formerlyBurma) andThailand. The border is 2,416 km (1,501 mi) in length and runs from thetripoint withLaos in the north to theAndaman Sea coast in the south.^[1]

The border starts in the north at the tripoint with Laos at the confluence of theKok andMekong Rivers and, after briefly following the Kok and then theSai, then proceeds overland to the west via a series of irregular lines through theDaen Lao Range, before turning to the south-west and joining theSalween River. The border follows the Salween and thenMoei River southwards, before leaving it and proceeding southwards overland through theDawna Range andBilauktaung Range (collectively these mountains form theTenasserim Hills). The border continues southwards down theMalay Peninsula, almost cutting Thailand in two atPrachuap Khiri Khan, before reaching theIsthmus of Kra and theKraburi River, which it then follows out via a wide estuary to the Andaman Sea. The maritime boundary then follows coordinates marked by the countries' continental shelf delimitation agreement towards the tripoint with India, which controls theAndaman and Nicobar Islands.

The border regions have historically been contested between the various Thai and Burmese states.^[2]Fighting between Burma and the SiameseAyutthaya Kingdom over control of what is now Myanmar'sTanintharyi Region dominated the area in the 16th century, before Burma destroyed Ayutthaya and took control of the region in 1767.^[2] Soon after, Siam extended suzerainty over theLanna Kingdom (nowNorthern Thailand), which had previously been under Burmese control. Burmese expansion in the 19th century brought it into conflict with the British inIndia, sparking a series ofconflicts which ended with Burma being occupied andincorporated intoBritish India.^[2] WithFrance occupyingFrench Indochina in the same period, the two European states allowed theKingdom of Siam (the old name for Thailand) to retain its independence as abuffer state.^[3][4]

In 1868 Britain and Siam signed a treaty delimiting the Burma-Thai border from the Salween south to the Andaman Sea.^[2] Following some confusion as to the border's location, on the ground demarcation of the border commenced from 1889 to 1892.^[2] In 1892 the northern section of the border delimited and then demarcated on the ground from 1893 to 1894, with a final boundary treaty with maps signed on 17 October 1894.^[2] The northern terminus of the border was fixed in 1896 when the British and French agreed that the Mekong would serve as the Burma-Laos border.^[2] Some minor boundary adjustments occurred in 1929 and 1934.^[2] In 1941, followingJapan'sinvasion of Burma, parts of Burma were ceded to Siam as theSaharat Thai Doem territory, however these areas were returned to Burma in 1946 following Japan's defeat and since then the border has remained in place.^[2][5][6] In 1937 Burma was separated from India and became a separate colony, gaining full independence in 1948, at which point the border became an international frontier between two sovereign states.^[2]

At present there is an outstanding dispute over the ownership of some small islands in the Andaman Sea.^[7]

From 2010 to 2012 there wereclashes along the border between the Myanmar army and theKaren National Liberation Army.^[8][9]

In 2021, the Myanmar military clashed with civilians in the border areas. Many of them fled and ended up in Thailand.^[10]

In 2023 there were more clashes and the governments of both countries have decided to form a humanitarian task force.^[11][12]

As of 2019^[update], there were 6 permanent border crossings, 1 temporary border crossing, 13 checkpoints forborder trade and 1 special checkpoint for border trade.^[13]

These border crossings are open for foreigners for travel purposes only.

These border crossings are open for cross-border local trade only. There are 13 checkpoints for border trade officially recognized by the Ministry of Interior, located inChiang Rai,Chiang Mai,Mae Hong Son andRanong provinces. Entering the opposite country beyond these checkpoints and their associated markets is illegal.

One special checkpoint for border trade is planned as a future permanent crossing. Entering the opposite country beyond these checkpoints and their associated markets is currently^{[may be outdated]} illegal.

• 
  A scenic viewpoint of the border along theDaen Lao Range from Thailand'sMae Sai District
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  Pier at Kawthaung
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  The border along the Moei river, with Myanmar on the opposite bank
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  Border gate at Mae Sai
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  The border bridge at Tachilek
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  Mae Sot border crossing
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  Border control gate at Dan Sing Khon

• Myanmar–Thailand relations

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