Join Gapforce Sumatra as we enter one of the worlds last wildernesses. Divided between Malaysia and Indonesia, the Sumatra project is based in Kalimantan.

Working with the new orangutan rehabilitation project, we head deep into the jungle to help construct rope bridges, hides and viewing structures.

Location for BBC TV series "Orang-utan Diary" we also trek into the jungle to track released orang-utans.

Trek through stunning and remote landscapes and work on vital conservation efforts. See a jaw-dropping mix of raging rivers, precipitous mountain ranges, unexplored caves and dense jungles.

Spot incredible wildlife including Wild boar, Macaques, Gibbons, Silver- and Red-leaf monkeys, Hornbills (The incredible state bird), Monitor lizards, frogs and an astonishing array of insects.