This trek follows the Barun Valley which contains some of the last remaining areas of pristine forests and alpine meadows in Nepal. From the bottom of the Arun Valley, near the start of the trek, the mountains rise from just 435m (1,430ft) above sea level to the lofty snow capped peak of Makalu at 8463m (27,760ft) within a distance of only 40km. The trek therefore passes through a wide diversity of ecosystems and cultures. Communities of Rai farmers give way to Sherpa and Bhotia villages as altitude is gained. These peoples live in isolated villages much as they have for centuries. Their livelihoods depend upon forest resources for animal fodder, fuel, food, housing materials, fertilizers and medicine.

Our itinerary has been carefully planned to allow for acclimatization to the altitude, and ample time in the area of \"low\" base camp for further exploration to high base camp at the foot of the Chago Glacier, and for those who wish, a climb to a high point of 6170m (20,240ft). There are some long days of 6 to 7 hours walking; some rough trail sections and the effects of altitude will be present.