Tanintharyi Region (; formerly Tenasserim Division and Tanintharyi Division) is a first-level administrative division of Myanmar, covering the long narrow southern part of the country on the northern Malay Peninsula, reaching to the Kra Isthmus. It borders the Andaman Sea to the west and the Tenasserim Hills, beyond which lie Thailand, to the east. To the north is the Mon State. There are many islands off the coast, the large Mergui Archipelago in the southern and central coastal areas and the smaller Moscos Islands off the northern shores. The capital city of the region is Dawei. Other important cities include Myeik (Mergui) and Kawthaung. The region covers an area of , and had a population of 1,406,434 at the 2014 Census.
Names Tanintharyi has historically been known by a number of names, reflecting changes in administrative control throughout history, as the region changed hands from the Kedah Sultanate, to the Hanthawaddy, Ayutthaya and Konbaung kingdoms, and British Burma. The region is called Tanah Sari in Malay, Tanao Si (, RTGS: Tanao Si, ) in Thai, and in Mon. In 1989, the Burmese government officially changed the division's English name from Tenassarim to Tanintharyi.
History Tanintharyi Region historically included the entire Tanintharyi salient–today's Tanintharyi Region, Mon State, and southern Kayin State. In the first millennium, its southern coastline formed part of the ancient emporium named Takkola in the Geōgraphikē Hyphēgēsis of Ptolemy. and in the Buddhist texts, Mahāniddesa and Milinda Panha. Takkola itself was also one of the five kingdoms in the confederative polity of Tun Sun. Meanwhile, the northernmost region was part of the Thaton Kingdom before 1057. The entire coastline later became part of King Anawrahta's Pagan Empire after 1057. After the fall of Bagan in 1287, the area fell to the Siamese kingdom of Sukhothai, and later its successor Ayutthaya Kingdom. The region's northernmost border was around the Thanlwin (Salween) river near today's Moulmein.
The region reverted to Burmese rule in 1564 when King Bayinnaung of Toungoo Dynasty conquered all of Siam. Ayutthaya had regained independence by 1587, and reclaimed the southern half of Tanintharyi in 1593 and the entire peninsula in 1599. In 1614, King Anaukpetlun recovered the northern half of the coast to Dawei but failed to capture the rest. Tenasserim south of Dawei (Tavoy) remained under Siamese control. Myeik (Mergui) port was a principal centre of trade between the Siamese and Europeans.
For nearly seven decades, from the middle of the 18th century to the early 19th century, Burma and Siam were involved in multiple wars for control of the coastline. Taking advantage of the Burmese civil war of 1740–1757, the Siamese cautiously moved along the coast to the south of Mottama in 1751. The winner of the civil war, King Alaungpaya of Konbaung Dynasty recovered the coastline to Dawei from the Siamese in 1760. His son King Hsinbyushin conquered the entire coastline in 1765. In the following decades, both sides tried to extend the line of control to their advantage but they both failed. The Burmese used Tanintharyi as a forward base to launch several unsuccessful invasions of Siam (1775–1776; 1785–1786; 1809–1812); the Siamese too were unsuccessful in their attempts to retake Tanintharyi (1787 and 1792). (On the northern front, Burma and Siam were also locked in a struggle for the control of Kengtung and Lan Na.)
Burma ceded the region south of Salween River to the British after the First Anglo-Burmese War (1824–1826) under the Treaty of Yandabo. The British and the Siamese signed a boundary demarcation treaty on 20 June 1826, and another one in 1868. Mawlamyine (Moulmein) became the first capital of British Burma. The British seized all of Lower Burma after the Second Anglo-Burmese War of 1852, and moved the capital to Rangoon. After 1852, the Tanintharyi Region consisted the entire southeastern part of Myanmar, including today's Mon State, Kayin State, and Taungoo District, in Bago Region. Mawlamyine was the capital of Tanintharyi.
Upon independence from Britain in 1948, the northeastern districts of Tanintharyi were placed into the newly created Karen State. In 1974, the northern part of remaining Tanintharyi was carved out to create Mon State. With Mawlamyine now inside Mon State, the capital of Tanintharyi Region was moved to Dawei.
Administrative divisions
Tanintharyi Region comprises ten townships and six subtownships, spreading over four districts:
NameListDawei DistrictDawei Township Launglon Township Thayetchaung Township Yebyu Township
Kaleinaung Subtownship Myitta SubtownshipMyeik DistrictKyunsu Township Myeik Township Palaw Township Tanintharyi Township
Palauk SubtownshipBokepyin DistrictBokpyin Township
Karathuri Subtownship Pyigyimandaing SubtownshipKawthoung DistrictKawthoung Township
Khamaukgyi Subtownship
Government
Executive The Tanintharyi Region Government is the executive body responsible for the governance and administration of Tanintharyi Region. Led by the Chief Minister of Tanintharyi Region, it carries out the duties prescribed to it by law and the 2008 Constitution of Myanmar.
The powers of the Tanintharyi Region Government include: Economic Development & Investment: The regional government has the authority to oversee local economic planning and approve localized business ventures through bodies like the Tanintharyi Region Investment Committee (TRIC). Local Municipal and Public Utilities: Managing local infrastructure, municipal services, regional town planning, and localized energy distribution. Agriculture and Natural Resources: Administering local salt production, local cutting of firewood, local fisheries, and state-sanctioned agricultural projects within Union-defined boundaries. Social Affairs & Relief: Executing regional public health initiatives, local sports, and providing immediate emergency relief supplies (such as flood and landslide aid) within regional townships.
The region government has also committed to humanitarian aid and disaster relief such as managing local civic programs and emergency response by providing flood and landslide relief supplies to affected households across Dawei, Launglon, Thayetchaung, and Tanintharyi townships.
Legislature
The Tanintharyi Region Hluttaw is the unicameral legislature of the region. With 28 seats, it is led by the Speaker. The latest elections for the legislature was the 2025-26 Myanmar general election.
The legislature's powers are prescribed in Schedule Two - Region or State Legislative List of the 2008 Constitution of Myanmar and include: Finance and Planning Sector - The region budget and fund; land revenue; excise duty except narcotic drugs and psychotropic substances; municipal taxes such as taxes on buildings and lands, water, street lightings and wheels, services of the region; sale, lease and other means of execution of property of the region; disbursement of loans in the country from the region fund; investment in the country from the region fund; local plans; and small loans businesses
Economic Sector - Economic matters undertaken in the region in accord with law enacted by the Union; commercial matters undertaken in the region in accord with law enacted by the Union; and co-operative matters undertaken in the Region in accord with law enacted by the Union
Agriculture and Livestock Breeding Sector - Agriculture; protection against and control of plants and crop pests and diseases; systematic use of chemical fertilizers and systematic production and use of natural fertilizers; agricultural loans and savings; dams, embankments, lakes, drains, and irrigation works having the right to be managed by the region; fresh water fisheries; and livestock breeding and systematic herding in accordance with the law enacted by the Union
Energy, Electricity, Mining and Forestry Sector - Medium and small scale electric power production and distribution that have the right to be managed by the region not having any link with national power grid, except large scale electric power production and distribution having the right to be managed by the Union; salt and salt products; cutting and polishing of gemstones within the region; village firewood plantation; and recreation centres, zoological gardens and botanical gardens
Industrial Sector - Industries other than those prescribed to be undertaken by the Union level; and cottage industries
Transport, Communication and Construction Sector - Ports, jetties, and pontoons having the right to be managed by the region; roads and bridges having the right to be managed by the region; and systematic running of private vehicles within the region
Social Sector - Matters on traditional medicine not contrary to traditional medicine policies prescribed by the Union; social welfare works within the region; prevention and precautionary measures against fire and natural disasters; stevedoring; having the right of management by the region the following: preservation of cultural heritage; museums and libraries; theatres, cinemas, and video houses; and exhibitions such as photographs, paintings, and sculptures
Management Sector - Development matters; town and housing development; and honorary certificates and awards
Judiciary
Tanintharyi Region High Court is the region's highest-level court.
Transport
Trains run on the Tanintharyi line between Yangon and Dawei. A deepwater port is planned in Dawei, a project that includes a highway and a railway line between Bangkok and that harbour.
The Maw Daung pass international cross-border checkpoint into Thailand has been developed since 2014.Maw-daung Pass Mapcarta
Demographics
In 2014, the region had a population of 1.4 million people. The region is home to Dawei people (also called Tavoyans), who form a subgroup of the Bamar people. The Dawei speak the Tavoyan dialect, a variety of Burmese with profound pronunciation and vocabulary differences from standard Burmese.
Ethnic makeup The Bamar — chiefly the Dawei and Bamar migrants — make up the majority of the region's population. The Karen comprise the region's largest minority. Other groups, such as Mons, Burmese Thai, Myeik, Burmese Malays, and Mokens, form small minorities. Nonetheless, numerous Burmese Thais are individuals without citizenship.
After the 2014 Census in Myanmar, the Burmese government indefinitely withheld release of detailed ethnicity data, citing concerns around political and social concerns surrounding the issue of ethnicity in Myanmar. In 2022, researchers published an analysis of the General Administration Department's nationwide 2018–2019 township reports to tabulate the ethnic makeup of the region.
Religion According to the 2014 Myanmar Census, Buddhists make up 87.5% of Tanintharyi Region's population, forming the largest religious community there. Minority religious communities include Christians (7.2%), Muslims (5.1%), and Hindus (0.2%) who collectively comprise the remainder of Tanintharyi Region's population. 0.1% of the population listed no religion, other religions, or were otherwise not enumerated.
According to the State Sangha Maha Nayaka Committee's 2016 statistics, 9095 Buddhist monks were registered in Tanintharyi Region, comprising 1.7% of Myanmar's total Sangha membership, which includes both novice samanera and fully-ordained bhikkhu. The majority of monks belong to the Thudhamma Nikaya (83.8%), followed by Shwegyin Nikaya (1.1%), with the remainder of monks belonging to other small monastic orders. 978 thilashin were registered in Tanintharyi Region, comprising 1.6% of Myanmar's total thilashin community.
Economy
Due to its proximity to the Indian Ocean, seafood products, including dried fish, dried shrimp and ngapi (shrimp paste), are a major part of its economy, for both domestic consumption and export to Thailand. Bird's nests are also gathered from offshore islands.