Hanoi is the capital of Vietnam. It is also the country's most important political, cultural, and educational city. Within the Red River Delta, Hanoi is approximately 3,360 km² and has over 8 million people, famous as the "city of rivers and lakes" because of the river Hồng, river Đuống, and over 100 lakes, such as lake “Hồ Tây” and lake “Hồ Gươm”.