Langtang National Park:
The Langtang National Park (LNP) was established in 1976 by Nepal Government t o conserve the unique flora and fauna in the central Himalayan Region of Nuwakot, Rasuwa, and Sindhupalchok districts. The park lies in a few hours distance to the north of Kathmandu. The Park extends over the mountainous terrain of the Nepal-Tibet Border. The area represents the meeting point between Indo-Malayan and Palearctic realms. Elevation gradients that range from mid-hills to alpine) and the complex topography have produced a rich biodiversity of flora and fauna.
The park is also a major trek area of Nepal. There are three main trek routes: 1) Langtang Valley 2) Helambu and d 3) Gosaikunda Lake regions. The popular and challenging trek areas of Panch Pokhari, Langsisa glacier, Kyanjin and Ganja La pass also lie in the Langtang National Park region. The closeness of the region from Kathmandu Valley attract a large number of local, regional, and international trekkers and nature lovers. The increasing tourism activities also helps the local people getting a wide market for their products and services. However, increased consumption of the natural resources and pollution also adversely affects the natural environment. Various conservation programs are run by national and international organization to minimize the adverse effects of human activities in the region.
Hence, the travelers in the Langtang Region are required to observe certain rules & regulations:

Langtang Park Permit and Regulation:
Entry Fee

For Foreign Nationals: NRs 1000 per person per entry
For SAARC Nationals:  NRs 100 per person per entry

• Travel inside the Park between sunset and sunrise is prohibited.
• Purchasing wildlife products and religious artifacts is illegal, and may incur penalty.
• The use of firewood is prohibited to save the trees.
• Rubbish must be disposed of at selected destinations in the Park, and non-biodegradable items must be carried out by the visitor.