Bangkok, officially known in Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies 1,568.7 square kilometres in the Chao Phraya River delta in central Thailand and has an estimated population of 10.539 million as of 2020, 15.3 per cent of the country's population.