Cloud forest in the Leuser ecosystem. Spanning 2.6m hectares (6.4m acres), Leuser is Sumatra’s largest rainforest and a Unesco world heritage site. It’s also the only place on Earth where rhinos, tigers, elephants and orangutans coexist in the wild. But it’s a vanishing ecosystem thanks to the rate of deforestation in the region, which is among the world’s highest.

Photograph: Paul Hilton/RAN