Annapurna region of the Himalaya is declared as Annapurna National Park by the Government of Nepal. The entire region is administered by the Annapurna Conservation Area Project (A.C.A.P.) which is working to conserve the natural and cultural resources of the area. The trekking in Annapurna region is one of the best example of Eco Tourism in Nepal. Annapurna is very popular for short and long treks. The reasons for popularity is numerous.

Pokhara is the starting point of all popular trekking and it is a finishing point for some of the best trekking in Nepal. The most popular trek in the country is the Annapurna Circuit trekking. Unlike Everest reason Pokhara is very close to the Annapurna reason. Hence you will be in the mountains in no time from Pokhara. The trek in this part of the country offer a great deal of cultural and geographic diversity; indeed the Jomsom and Annapurna Circuit treks both go to the north of the Himalayan watershed, into the dry desert area which is properly part of the Tibetan plateau. The Annapurna Circuit trekking and Jomsom and Muktinath trekking are Trans Himalayan Treks.

In and around Pokhara valley also offers a number of one-day treks or short three or four-day treks. The most popular among short treks is trekking up to Poonhill. The Annapurna Sanctuary Trek takes you right in among the mountains of the Annapurna Range and the base camp of Mt. Machhapuchhre. The Jomsom Trek is essentially the final third of the Annapurna Circuit. It follows the Kali Gandaki valley between the soaring peaks of Annapurna and Dhoulagiri and finally emerges to the north of the main Himalayan range, on the dry, desert - like Tibetan plateau. The final destination is the holy temple of Muktinath, a farther day's walk beyond Jomsom. The return to Pokhara can either be made by retracing your steps down the Kali Gandaki valley or by flying from Jomsom to Pokhara. Annapurna Circuit trekking is a great Trans-Himalayan trekking among most spectacular treks in Annapurna region. It is very popular and is World class Trekking. 

Trekking in Langtang region is not as well known as trekking in Everest region (east Nepal) or as trekking in Annapurna region (west Nepal). The Langtang region is just north of Kathmandu valley. Hence it is very easily accessible from Kathmandu. Langtang region is declared National Park in 1976. Langtang National Park encloses the catchments of two major river systems' one draining west into the Trishuli River and the other east to the Sunkoshi River. The area extends from 32 km north of Kathmandu to the Nepal China border. Most of the treks are around three important destinations in the region. They are Helambu, Gosaikunda, and Langtang valley.

Helambu: The Helambu area, immediately north of Kathmandu, has many scenic villages inhabited by Sherpa and Tamang.
Gosaikunda: is a glacier lake. There are other glacier lakes. Gosaikunda is the most famous one. It is believed Lord Shiva has created it. Gosaikunda is accessed either from Dhunche or from Sundarijal in the eastern part of Kathmandu Valley. Thousands of Hindu pilgrims visit these lakes during auspicious day of full moon at August called Janai Purnima.
Langtang Valley: The Langtang Valley is reached from the road end at Dhunche or Syabrubesi. It's a long and wide valley at 4000 m altitude, shaped by glaciers. For 10-20 km, the valley floor is almost flat. Dhunche and Melamchi are easily accessed by bus or private vehicle. The trekking in Langtang is relatively remote and unpopulated area. The trekking are from one to two weeks. The most popular one is Helambu/Gosaikunda loop.