CargoOne. yes most airfields around there are demanding due to mountains or jungle. I am not a pilot but as pax, I went to Sentani/Jayapurea, Wamena and a jungle strip south of Wamena. The latter was rather narrow and the Islander’s wingtip clipped the leaves on a tree upon takeoff.
Interestingly there was a lot of freight going inland from Sentani as there were no roads to carry all the cement, etc. needed inland, but almost no freight coming out. So you bought your ticket to go inland and just hopped on any passing plane without a ticket to return. Don’t know whether this system still exists. Must cause insurance problems as how do you pin your injury/death on the operator if you have no ticket?