We enter a narrow corridor between two thickly forested islands, an osprey watching us guardedly from its penthouse nest.

And the hills grow more thickly forested as we rise.

But as soon as they set foot on the thickly forested paradise, they realised the challenge was going to be even bigger than they had imagined.

Thickly forested, these hills cover areas ranging from a hectare to several square kilometers (acres to square miles).

More mills were established in the thickly forested hills and the timber was transported on tramlines across swamps and taken to seaports by barges.