Tenasserim Hills

Tenasserim Hills
တနင်္သာရီ တောင်တန်း ทิวเขาตะนาวศรี Banjaran Tanah Seri بنجرن تنه سري 丹那沙林山脉 丹那沙林山脈
View from the Burma Railway over the Kwai River, Kanchanaburi Province
Highest point
Peak	Mount Tahan (Malaysia)
Elevation	2,187 m (7,175 ft)
Coordinates	4°38′00″N 102°14′00″E / 4.63333°N 102.23333°E / 4.63333; 102.23333
Dimensions
Length	1,670 km (1,040 mi) N/S
Width	130 km (81 mi) E/W
Geography
Extent of the Tenasserim Hills and their subranges
Countries	Myanmar, Thailand and Malaysia
Parent range	Indo-Malayan System
Borders on	Dawna Range, Shan Hills, Thai highlands
Geology
Age of rock	Permian and Triassic
Type of rock	Granite and Limestone

The Tenasserim Hills or Tenasserim Range (Burmese: တနင်္သာရီ တောင်တန်း, [tənɪ̀ɰ̃θàjì tàʊɰ̃dáɰ̃]; Thai: ทิวเขาตะนาวศรี, RTGS: Thio Khao Tanao Si, pronounced [tʰīw kʰǎw tā.nāːw sǐː]; Malay: Banjaran Tanah Seri/Banjaran Tenang Sari) is the geographical name of a roughly 1,700 km long mountain chain, part of the Indo-Malayan mountain system^[1] in Southeast Asia.

Despite their relatively scant altitude these mountains form an effective barrier between Thailand and Myanmar in their northern and central region.^[2] There are only two main transnational roads and cross-border points between Kanchanaburi and Tak, at the Three Pagodas Pass and at Mae Sot. The latter is located beyond the northern end of the range, where the Tenasserim Hills meet the Dawna Range. Minor cross-border points are Sing Khon,^[3] near Prachuap Khiri Khan, as well as Bong Ti and Phu Nam Ron west of Kanchanaburi. The latter is expected to gain in importance if the planned Dawei Port Project goes ahead, along with a highway and a railway line between Bangkok and that harbor.^[4]

The southern section of this extensive chain of mountains runs along the Kra Isthmus into the Malay Peninsula almost reaching Singapore. Many rivers have their source in these mountains, but none of them are very long.