View of local market in Nepal. People enjoying fruit chat on streets of Kathmandu city, Nepal.

Kathmandu is the capital and largest municipality of Nepal. Kathmandu, Biratnagar and Pokhara are the first, second and third largest cities of Nepal respectively. It is the only city of Nepal with the administrative status of Mahanagar (Metropolitan City), as compared to Upa-Mahanagar (Sub-Metropolitan City) or Nagar (City). Kathmandu is the core of Nepal's largest urban agglomeration located in the Kathmandu Valley consisting of Lalitpur, Kirtipur, Madhyapur Thimi, Bhaktapur and a number of smaller communities. Kathmandu is also known informally as "KTM" or the "tri-city". According to the 2011 census, Kathmandu Metropolitan City has a population of 1,003,285 and measures 49.45 square kilometres (19.09 sq mi).

The city stands at an elevation of approximately 1,400 metres (4,600 ft) in the bowl-shaped Kathmandu Valley of central Nepal. It is surrounded by four major mountains: Shivapuri, Phulchoki, Nagarjun, and Chandragiri. Kathmandu Valley is part of three districts (Kathmandu, Lalitpur, and Bhaktapur), has the highest population density in the country, and is home to about a twelfth of Nepal's population.

Historically, the Kathmandu Valley and adjoining areas were known as Nepal Mandala. Until the 15th century, Bhaktapur was its capital when two other capitals, Kathmandu and Lalitpur, were established. During the Rana and Shah eras, British historians called the valley itself "Nepal Proper". Today, Kathmandu is not only the capital of the Federal Democratic Republic of Nepal, but also the headquarters of the Bagmati Zone and the Central Development Region of Nepal.

Kathmandu is the gateway to tourism in Nepal. It is also the hub of the country's economy. It has the most advanced infrastructure of any urban area in Nepal, and its economy is focused on tourism, which accounted for 3.8% of Nepal's GDP in 1995–96. Tourism in Kathmandu declined thereafter during a peri