from Wikipedia Kathmandu:
Kathmandu (Nepali: काठमांडौ, Nepal Bhasa: येँ) is the capital and the largest city of Nepal. The city is situated in Kathmandu Valley that also contains two other cities - Patan and Bhaktapur. Nepali is the lingua franca of the valley and is the most widely spoken language. Nepal Bhasa/Newari is the language spoken by native people, the Newars. The city stands at an elevation of approximately 4,500 ft (1,400 m) and is inhabited by about 700,000 people. Kathmandu is the most developed city in Nepal.