Tenasserim Hills in the context of Tectonic setting

The Malay Peninsula is located in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, it is the southernmost point of the Asian continental mainland. The area contains Peninsular Malaysia, Southern Thailand, and the southernmost tip of Myanmar (Kawthaung). The island country of Singapore also has historical and cultural ties with the region.

The Titiwangsa Mountains are part of the Tenasserim Hills system and form the backbone of the peninsula and the southernmost section of the central cordillera, which runs from Tibet through the Kra Isthmus, the peninsula's narrowest point, into the Malay Peninsula. The Strait of Malacca separates the Malay Peninsula from the Indonesian island of Sumatra, and the south coast is separated from the island of Singapore by the Straits of Johor.

Tanintharyi Region, formerly Tenasserim Division and Tanintharyi Division, is a region 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 of the division is Dawei (Tavoy). Other important cities include Myeik (Mergui) and Kawthaung. The division covers an area of 43,344.9 square kilometres (16,735.6 sq mi), and had a population of 1,406,434 at the 2014 Census.

The Kra Isthmus (Thai: คอคอดกระ, pronounced [kʰɔ̄ː kʰɔ̂ːt kràʔ]; Malay: Segenting Kra), also called the Isthmus of Kra in Thailand, is the narrowest part of the Malay Peninsula. The western part of the isthmus belongs to Ranong province and the eastern part to Chumphon province, both in Southern Thailand. At its narrowest point, between the Thai cities of Kra Buri and Chumphon, the coastal distance between the Andaman Sea and the Gulf of Thailand is only 44 km (27 mi).

The Kra Isthmus marks the boundary between two sections of the mountain chain which runs from Tibet through the Malay peninsula. The southern part is the Phuket Range, which is a continuation of the Tenasserim Hills, extending further northwards for over 400 km (250 mi) beyond the Three Pagodas Pass.

Selangor (/səˈlæŋər/ sə-LANG-ər; Malay: [s(ə)ˈlaŋo(r)]), also known by the Arabic honorific Darul Ehsan, or "Abode of Sincerity", is one of the 13 states of Malaysia. It is on the west coast of Peninsular Malaysia and is bordered by Perak to the north, Pahang to the east, Negeri Sembilan to the south, and the Strait of Malacca to the west. Selangor surrounds the federal territories of Kuala Lumpur and Putrajaya, both of which were previously part of it. Selangor has diverse tropical rainforests and an equatorial climate. The state's mountain ranges belong to the Titiwangsa Mountains, which is part of the Tenasserim Hills that covers southern Myanmar, southern Thailand and Peninsular Malaysia, with Mount Semangkok as the highest point in the state.

The state capital of Selangor is Shah Alam, and its royal capital is Klang, Kajang is the largest municipality by total metropolitan population and Petaling Jaya is the largest municipality by total population within the city. Petaling Jaya and Subang Jaya received city status in 2006 and 2019, respectively. Selangor is one of four Malaysian states that contain more than one city with official city status; the others are Sarawak, Johor, and Penang.

Central Thailand (Central Plain) (historically also known as Siam or Dvaravati) is one of the regions of Thailand, covering the broad alluvial plain of the Chao Phraya River. It is separated from northeast Thailand (Isan) by the Phetchabun mountain range. The Tenasserim Hills separate it from Myanmar to the west. In the north it is bounded by the Phi Pan Nam Range, one of the hilly systems of northern Thailand. The area was the heartland of the Ayutthaya Kingdom (at times referred to as Siam) and is still the dominant area of Thailand since it contains the world's most primate city, Bangkok.

Mount Tahan (Malay: Gunung Tahan), is the highest point in Peninsular Malaysia with an elevation of 2,187 m (7,175 ft) above sea level, on the border between the states of Pahang and Kelantan, with the peak lying on the Pahangite side. It is part of the Taman Negara that straddles Jerantut District in Pahang, Gua Musang District in Kelantan and Hulu Terengganu District in Terengganu. The mountain is part of the Tahan Range in the Tenasserim Hills and is popular with local climbers.

Gunung Tahan is considered by many to be one of the toughest treks in Peninsular Malaysia.

Khao Nom Nang (Thai: เขานมนาง), "female breast mountain", is a 752 metres (2,467 ft) high mountain in the Tenasserim Hills in Kanchanaburi Province, Thailand.

Three Pagodas Pass (Phlone ကၠံင်သိုင့်ဖၠုံးလါင့်ဆေါတ်ဖိုင်သာ့; Burmese: ဘုရားသုံးဆူ တောင်ကြားလမ်း, Paya Thon Zu Taung Za Lang, Burmese pronunciation: [pʰajá θóʊɰ̃ zù tàʊɰ̃ dʑá láɰ̃]; Thai: ด่านเจดีย์สามองค์, RTGS: Dan Chedi Sam Ong, Thai pronunciation: [dàːn tɕeːdiː sǎːm ʔoŋ]) is a pass in the Tenasserim Hills on the border between Thailand and Myanmar (Burma), at an elevation of 282 metres (925 ft). The pass links the town of Nong Lu in the north of Kanchanaburi Province, Thailand, to the town of Payathonzu in the south of Kayin State, Myanmar.

The Dawna Range (Burmese: ဒေါနတောင်တန်း, MLCTS: Dau:na. Taung:tan:; Thai: ทิวเขาถนนธงชัยตะวันตก, ทิวเขาดอยมอนกุจู), also known as Dawna Hills, is a mountain range in eastern Myanmar and northwestern Thailand. Its northern end is located in Kayah State where it meets the Daen Lao Range, a subrange of the Shan Hills. The range runs southwards along Kayin State as a natural border with Mon State in the west forming parallel ranges to the northern end of the Tenasserim Hills further south and southeast. The Dawna Range extends east of the Salween southwards from the Shan Hills for about 350 km, at the western limit of the Thai highlands. Its southern end reaches the Thai–Myanmar border in the Umphang area, entering Thailand west of Kamphaeng Phet. The Thung Yai Naresuan Wildlife Sanctuary is in the Thai side of the range.

Some geographers include the Dawna Range as the western and the southern part of the Thanon Thong Chai Range (เทือกเขาถนนธงชัย). The highest point of the range is 2,080 m high Mela Taung; 2,005 m high Mulayit Taung is located at the southern end of the range.

Singkhon Pass (Thai: ด่านสิงขร), also referred to as Sing Khon and as Maw Daung after the name of the Burmese town west of the border, is a pass across the Tenasserim Hills on the border between Thailand and Myanmar, at an elevation of 245 metres (804 ft). The pass is close to the narrowest point of Thailand in Khlong Wan (คลองวาฬ) subdistrict, Mueang Prachuap Khiri Khan District, Prachuap Khiri Khan Province.

Prachuap Khiri Khan (Thai: ประจวบคีรีขันธ์, pronounced [prā.tɕùap kʰīː.rīː kʰǎn]) is a town in western Thailand. It is the capital of Prachuap Khiri Khan Province and is on the coast close to the narrowest stretch in Thailand, only 10 kilometres (6.2 mi) from the border with Myanmar at Dan Sing Khon in the Tenasserim Hills. The area has large pineapple and coconut industries, in addition to being popular with Thai tourists. The town is 291 km south of Bangkok by road.

Phu Nam Ron (Thai: พุน้ำร้อน) is a pass across the Tenasserim Hills on the border between Thailand and Myanmar, at an elevation of 350 metres (1,150 ft). The border checkpoint on the Thai side is in Ban Kao subdistrict, Mueang Kanchanaburi district, Kanchanaburi province.

The Phuket Range (Thai: ทิวเขาภูเก็ต, Thio Khao Phuket, IPA: [tʰiw kʰǎw pʰuː.kèt]) is a subrange of the Tenasserim Hills in the Kra Isthmus, Thailand.

Perak (Malay pronunciation: [peraʔ]; Perak Malay: Peghok) is a state of Malaysia on the west coast of the Malay Peninsula. Perak has land borders with the Malaysian states of Kedah to the north, Penang to the northwest, Kelantan and Pahang to the east, and Selangor to the south. Thailand's Yala and Narathiwat provinces both lie to the northeast. Perak's capital city, Ipoh, was known historically for its tin-mining activities until the price of the metal dropped, severely affecting the state's economy. The royal capital remains Kuala Kangsar, where the palace of the Sultan of Perak is located. The state's population is 2,000,000.

Perak has diverse tropical rainforests and an equatorial climate. The state's main mountain ranges are composed of the Titiwangsa, Bintang and Keledang Ranges, where all of them are part of the larger Tenasserim Hills system that connects Myanmar, Thailand and Malaysia.

Tahan Range (Malay: Banjaran Tahan) is a mountain range in Pahang and Kelantan, Malaysia. Along with the Titiwangsa Mountains to its west, the Tahan Range forms the southernmost extension of the larger Tenasserim Hills chain of mountains. Its namesake highest peak, Gunung Tahan, is the tallest mountain in Peninsular Malaysia and the whole Tenasserim Hills, standing at 2,187 metres above sea level.

The Malay Peninsula is located in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, Tanjung Piai, it is the southernmost point of the Asian continental mainland. The area contains Peninsular Malaysia, Southern Thailand, and the southernmost tip of Myanmar (Kawthaung). The island country of Singapore also has historical and cultural ties with the region.

The Titiwangsa Mountains are part of the Tenasserim Hills system and form the backbone of the peninsula and the southernmost section of the central cordillera, which runs from Tibet through the Kra Isthmus, the peninsula's narrowest point, into the Malay Peninsula. The Strait of Malacca separates the Malay Peninsula from the Indonesian island of Sumatra, and the south coast is separated from the island of Singapore by the Straits of Johor.

Perlis (Kedah Malay (Perlis dialect): Peghelih) is a state of Malaysia in the northwestern coast of Peninsular Malaysia. It is the smallest state in Malaysia by area and population. The state borders the Thai provinces of Satun and Songkhla to the north and the Malaysian state of Kedah to the south. Perlis is the only Malaysian state that is not divided into districts, due to its small size, but it is still divided into several communes. It was called Palit (Thai: ปะลิส) by the Siamese when it was under their influence. Perlis had a population of 227,025 as of the 2010 census.

Perlis experiences a tropical monsoon climate. Much of the state's highlands are part of the Nakawan Range, a subrange of the Tenasserim Hills system that spans through southern Myanmar, Southern Thailand and the Peninsular Malaysia, with Mount Perlis as the highest point at 733 m. The Nakawan also forms a natural frontier between Perlis and Thailand.

Anaukbaklun (Burmese: အနောက်ဘက်လွန် [ʔənaʊʔ pʰɛʔ lʊ̀ɰ̃]; 21 January 1578 – 9 July 1628) was the sixth king of Taungoo Burma and was largely responsible for restoring the kingdom after it collapsed at the end of the 16th century. In his 22-year reign from 1606 to 1628, Anaukpetlun completed the reunification efforts begun by his father, King Nyaungyan. Having inherited a partial kingdom comprising mainly Upper Burma and the Shan States from his father, Anaukpetlun went on to reconquer Lan Na in the east, and in the south, Lower Burma from rival Burmese factions and the Portuguese, as well as the Upper Tenasserim from the Ayutthaya Kingdom. The kingdom was known as the Restored Taungoo Kingdom or Nyaungyan Dynasty.