Kathmandu (Nepali: काठमाडौं [kɑʈʰmɑɳɖu]; Nepal Bhasa: येँ देय्) is the capital and largest urban agglomerate of Nepal. The agglomerate consists of Kathmandu Metropolitan City at its core, and its sister cities Patan, Kirtipur, Thimi, and Bhaktapur. It also includes the recently recognized urban areas of Shankhapur, Karyabinayak, and Champapur. Banepa, Dhulikhel, and Panauti are satellite urban areas of Kathmandu located just outside the Kathmandu valley. Kathmandu is also known informally as "KTM" or the "tri-city". According to a census conducted in 2011, Kathmandu metropolis alone has 975,453 inhabitants; and the agglomerate has a population of more than 2.5 million inhabitants. The metropolitan city area is 50.67 square kilometres (19.56 sq mi) and has a population density of 19,250 per km².
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.
The Kathmandu Valley (Nepal Bhasa: स्वनिगः Svanigaḥ [sʷoniɡəː], Nepali: काठमाडौँ उपत्यका), located in Nepal, lies at the crossroads of ancient civilizations of Asia, and has at least 130 important monuments, including several places of pilgrimage for the Hindus and the Buddhists. There are seven UNESCO World Heritage Sites within this valley. Historically, only the Kathmandu Valley was referred to as "Nepal" by people who lived outside the valley. After the annexation of the valley by the Gorkha kingdom, and subsequent conversion of the valley as the capital of their empire, this designation of "Nepal" was extended to every land they conquered.
The Kathmandu valley has many nicknames like " K-Town", "City Of Event", "Cherry On The Cake". It is the most developed and populated place in Nepal. The majority of offices and headquarters are located in the valley making it the economic hub of Nepal. It is popular with tourists for its unique, rich, culture and architecture; including the highest number of jatras in Nepal. The valley itself was referred to as "Nepal Proper" by British historians.