Langtang is a narrow valley that lies just south of the Tibetan border. It is squeeze in between the main Himalayan range to the north and a slightly lower range of snowy peaks to the south. Langtang Lirung (7246m.) dominates the valley to the north; Gang Chhenpo (6388m.) and Naya Kangri (5846m.) lie to the south; and Dorje Lakpa (6966m.) protects the east end of the valley. The area was designated Nepal's first Himalayan national park in 1971. Langtang has over 70 glaciers of varying sizes; the Langtang and Ganesh Himal mountain ranges. The three major areas are Langtang, Gosainkunda (a holy lake at 4300m) and Helambu, which is combined in many different ways to make treks from 7 to more than 16 days. Hence, the name – Lang in Tibetan means ‘yak’ and ‘tang’ means ‘to follow’. Yaks still live in the valley. Other remarkable places on this trip are GosainKunda (4610m.) and Helambu. Gosainkunda is a sacred lake, which is very important for both Hindus and Buddhist. Thousands of Hindu pilgrims visit the lake during a full moon festival that is observed on August every year.

Helambu valley is very famous for its natural beauty and wonderful climate with the outstanding views of the magnificent snow-covered mountains. The area covers typical highland of Sherpa villages along with beautiful Rhododendron forests. This region extends from the north to Taramarang to the Gosainkund Lake and the lower Jugal Himal from the north. This valley is approached from Trishuli River Valley, which is in north side of Kathmandu.