The Kingdom of Thailand (IPA: /ˈtaɪlænd/, Thai: ราชอาณาจักรไทย, IPA: [râːtɕʰa-ʔaːnaːtɕɑ̀k-tʰɑj]) is an independent country which lies in the heart of Southeast Asia. The country is bordered to the north by Laos and Burma, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the west by the Andaman Sea and Burma. By the maritime boundary, the country is bordered to the southeast by Vietnam in the Gulf of Thailand, to the southwest by Indonesia and India in the Andaman Sea. The capital and largest city of Thailand is Bangkok. It is also the country's centre of political, commercial, industrial and cultural activities. Bangkok is known in Thai as "Krung Thep Mahanakorn," or, more colloquially, "Krung Thep." Thailand is considered to be the world's 50th largest country in terms of total area, with a surface area of approximately 513,000 km² (198,000 sq mi), and the world's 20th largest country in terms of population with approximately 63 million people. At 514,000 km² (198,000 sq mi) , Thailand is the world's 50th largest country in land mass, whilst it is the world's 20th largest country in terms of population. It is comparable in population to countries such as France and United Kingdom, and is similar in land size to France and California in the US; it is just over twice the size of the entire United Kingdom, and 1.4 times the size of Germany. Thailand is home to several distinct geographic regions, partly corresponding to the provincial groups. The north of the country is mountainous, with the highest point being Doi Inthanon at 2,565 metres above sea level (8,415 ft). The northeast, Isan, (see special section on this region) consists of the Khorat Plateau, bordered to the east by the Mekong river. The centre of the country is dominated by the predominantly flat Chao Phraya river valley, which runs into the Gulf of Thailand. The south consists of the narrow Kra Isthmus that widens into the Malay Peninsula.