Three Pagodas Pass (Thai: ด่านเจดีย์สามองค์, pronounced 'Darn Chedi Sam Ong') is a pass through the Bilauktaung Mountains on the border between Thailand and Myanmar, at an altitude of 282 metres. The pass links the town of Sangkhlaburi in the north of Kanchanaburi province, Thailand to the town of Payathonzu in Myanmar.

This pass has been the main land route into western Thailand since ancient times, and is believed be the point at which Buddhist teachings reached the country from India in the 3rd century. During the Ayutthaya period in Thai history (14th-18th centuries), the pass was the main invasion route for the Burmese, but was also occasionally used in the opposite direction by Thai armies. The three small, crumbling pagodas, or chedis, after which the pass is named, were probably built at the end of this period as a symbol of peace. They are now on the Thai side of the border.

During World War II, Japan built the infamous Death Railway through the pass. There is a plaque here to commemorate the Australian prisoners of war who (with many other Allied soldiers and Asian civilians) died as forced labourers during the building of the railway.

The area is home to a number of mountain peoples, including Karens, Mons and Burmese, who are unable or unwilling to obtain citizenship of either of the neighbouring countries. Since the end of World War II, there have been regular attempts by rebel armies to take control of the pass from Myanmar, with the Mon group in effective control until 1990, when Myanmar regained control. There are also occasional skirmishes between Karen and Mon rebel groups.

Nowadays, the pass is popular with tourists who, subject to the occasional hostilities between the two countries, are allowed to obtain a one-day visa from the Thai side to visit Payathonzu. Tourist attractions on the Burmese side include the locally made wooden furniture, jade carvings, and textiles.

Extracted from Wikipedia: Three Pagodas Pass