Gangtok is the capital of Sikkim, India. It is a popular tourist destination known for its beautiful landscapes, monasteries, and vibrant culture. Know more. Gangtok (Nepali: gāntok, pronounced [gantok], Sikkimese: [ɡaŋt̪ʰòk]) is the capital and the most populous city of the Indian state of Sikkim. The seat of eponymous district, Gangtok is in the eastern Himalayan range, at an elevation of 1,650 m (5,410 ft). Gangtok is known for its stunning physical beauty, pleasant climate, remarkable architectural beauty of the famous monasteries and rich cultural heritage. Apart from these attractions, Gangtok is also known for adventure activities like trekking, paragliding, river rafting and other thrills. Gangtok , city, capital of Sikkim state, northeastern India. It lies on a tributary of the Tista River in the southeast-central part of the state at an elevation of about 5,600 feet (1,700 metres). The city’s name means “Top of the Hill.” Gangtok rises over slopes extensively terraced in corn (maize).