Thailandformerly known as Siam, is a country at the centre of the Indochinese peninsula in Mainland Southeast Asia.Bangkokis the capital and most populous city of Thailand. It is known in Thai as Krung Thep Maha Nakhon.Hua Hinis one of eight districts (amphoe) of Prachuap Khiri Khan Province in the northern part of the Malay Peninsula in Thailand. Its capital, also named Hua Hin, is a beach resort town sometimes written as "Chiengmai" or "Chiangmai", is the largest and most culturally significant city in Northern Thailand.Hat Yai, also Haad Yai or Had Yai is a city in southern Thailand near the Malaysian border.The Chao Phrayais a major river in Thailand, with its low alluvial plain forming the centre of the country. It flows through Bangkok and then into the Gulf of Thailand.The Mekongis a trans-boundary river in Southeast Asia. It is the world's 12th-longest river and the 7th-longest in Asia.Doi Inthanonis the highest mountain in Thailand.