Thailand’s capital and most populous city is Bangkok, sometimes referred to as Krung Thep Maha Nakhon[b] in Thai and simply Krung Thep. The predicted population of the city, which makes up 13% of the nation’s total, is 9.0 million as of 2021. It is located in the Chao Phraya River delta in central Thailand and spans 1,568.7 square kilometers (605.7 sq mi). According to estimates from 2021, the Bangkok Metropolitan Region was home to about 17.4 million people (or 25% of the country’s total population), making Bangkok an extreme primate metropolis that dwarfs all other urban centers in Thailand in terms of both size and economic significance.