Thailand ( Thai), officially the Kingdom of Thailand also known as Siam  is a country located at the centre of the Indochina peninsula and Southeast Asia, bordered to the north by Burma and Laos, east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the west by the Andaman Sea and the southern extremity of Burma. Its maritime boundaries include Vietnam in the Gulf of Thailand to the southeast and Indonesia and India in the Andaman Sea to the southwest.

Thailand is the world's 51st largest country in terms of total area with a surface area of approximately 513,000 km² (198,000 sq mi) with approximately 64 million people. The largest city is Bangkok, the capital, which is also the country's center of political, commercial, industrial and cultural activities. About 75% of the population is ethnically Thai, 14% is of Chinese origin, and 3% is ethnically Malay; the rest belong to minority groups including Mons, Khmers and various hill tribes.

The country's official language is Thai. The primary religion is Buddhism, which is practiced by around 95% of all Thais.

Thailand experienced rapid economic growth between 1985 and 1995 and is a newly industrialized country with tourism, due to well-known tourist destinations such as Ayutthaya, Pattaya, Bangkok, Phuket, Krabi, Chiang Mai, and  Ko Samui, and exports contributing significantly to the economy.There are approximately 2.2 million legal and illegal migrants in Thailand. Thailand has also attracted a number of expatriates from developed countries.