The Dolpo region is the natural embodiment of high passes, rare flora and fauna, and sweeping vistas, which is enriched by the traditional Tibetan cultural heritage. This region, surrounded by Dhaulagiri and Tibet from south and north, respectively, is regarded as a blend of natural and cultural phenomena. It was opened in 1991 for trekking. This region lies on the north side of Himalayas , it is also a rain shadow area and the climatic situation of this place is same as that of Mustang. One of the longest treks in Nepal is Dolpo Trek that takes 34 days to complete. In this trek, the maximum elevation will be 4,530 m. to 5,115 m. and is one of the most arduous treks of the country. Kanchanjunga TrekLiterally the Kanchanjunga means crystal clear in Nepali while geographically the Kanchanjunga mountain is the second tallest in Nepal and the third tallest in the world after the Mt. Everest of Nepal and the K2 of Pakistan. The whole trekking areas in this region stretches through and around Arun River whose origin dates back to prehistoric period. The Arun valley is one of the most beautiful regions to trek in Nepal . Traveling around this part also gives an opportunity to enjoy and experience the traditional culture of Rai and Limbu, the native locals of this area. Trekking in this area is an adventure that is full of enthusiasm, excitement and above all, an unforgettable life time experience.