The Kathmandu Valley (काठमाडौं उपत्यका), also known as the Nepal Valley or Nepa Valley (नेपाः उपत्यका, Nepal Bhasa: 𑐣𑐾𑐥𑐵𑑅 𑐐𑐵𑑅, नेपाः गाः), is a bowl-shaped valley located in the Himalayan mountains in Nepal. It lies at the crossroads of ancient civilizations of the Indian subcontinent and the broader Asian continent, and has at least 130 important monuments, including several pilgrimage sites for Hindus and Buddhists. There are seven World Heritage Sites within the valley.
The Kathmandu Valley is the most developed and the largest urban agglomeration in Nepal with about 5 million population. The urban agglomeration of Kathmandu Valley includes the cities of Kathmandu, Lalitpur, Budhanilkantha, Tarakeshwar, Gokarneshwar, Suryabinayak, Tokha, Kirtipur, Madhyapur Thimi, Bhaktapur, Changunarayan, and others. 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 architecture, and rich culture which includes the highest number of jatras (festivals) in Nepal. Kathmandu valley itself was referred to as "Nepal Proper" by British historians. As per the World Bank, the Kathmandu Valley was one of the fastest growing metropolitan areas in South Asia with 2.5 million population by 2010 and an annual growth rate of 4%.
In 2015, Kathmandu Valley was hit by the April 2015 Nepal earthquake. The earthquake caused thousands of deaths and the destruction of much infrastructure across the Kathmandu Valley, which includes the towns of Lalitpur, Kirtipur, Madhyapur Thimi, Changunarayan, and Bhaktapur. Kathmandu is also the largest city in the Himalayan hill region.
Historically, the valley and adjoining areas made up a confederation known as the Nepal Mandala. Until the 15th century, Bhaktapur was its capital, when two other capitals, Kathmandu and Lalitpur (Patan), were established. Until the 1960s, the Kathmandu Valley was known as the Nepala Valley or Nepa Valley. In 1961 the valley was listed as Kathmandu District, which began referring to the valley as Kathmandu Valley.