Makalu ( 8,463 m. ), the fifth highest mountain of the world lying on the Nepal- Tibet border has the virtue of observing the Nepal's most major peaks to the east of the Everest. The trek starts right from the Arun Valley. This region, considered as one of the non-tourist areas has a wonderful charm to explore and always done with a well-supervised and guided group with sensible equipment.

Makalu trekking in eastern Nepal is protected by the Makalu Barun National Park and Conservation Project. Established in 1992, it covers 2330 sq km. Among the 16 mountains in the park, it is home to Makalu, the fifth highest mountain in the world (8463m/ 27,766ft).

This mainly low altitude trek is centered on the Arun Valley, in eastern Nepal. The sub-tropical valley floor of the mighty Arun River is in places densely forested, contrasting with the terraced slopes higher up, which are farmed by villagers of diverse tribal groups. High pastures typify the upper slopes, which border on the Makalu-Barun National Park, an important conservation area for many threatened species