Kathmandu is the capital and largest city of Nepal, situated in the central part of the country within the Kathmandu Valley. The city is in Kathmandu District. Kathmandu is the main governmental, financial, industrial, and cultural centre of Nepal. As per the 2021 Nepal census, it has a population of 845,767 residing in 105,649 households, with approximately 4 million people in the surrounding metropolitan area. The city stands at an elevation of 1,324 metres (4,344 ft) above sea level. From ancient times until the medieval period, Kathmandu was known as Kantipur and is also referred to as Kasthamandap.
Summary from Wikipedia.