Korupun (sometimes spelled Koropun) in the highlands of West Papua, has one of the world’s scariest air strips. See this video of a take-off and landing at the strip.
I can attest to the difficulty of landing here; I spent two weeks in the mountains above Korupun in 1995. Planes start by flying over the strip to check for pigs, then have to make one full circle to get low enough to land. When taking off, the plane has to make a 90 degree turn to avoid the mountain wall across the valley, followed by a full turn to get out of the steep walled valley. It’s an experience!
» One of world’s scariest airports