Alright, time for a new addition: The Island in the Sky.
In Putan, the one man noticed something peculiar out in the middle of The Pit (or where the waterfall drops into oblivion). He noticed a large stone pillar rising like a monolith right up to the top of the waterfall.
By now, the one man had noticed that the elements of Putan could be combined to create strong materials. And so, he channeled magma from the nearby Volcano Island and combined it with the tempermental earth from the islands where he'd built Waterwheel Stations. By combining and channeling these elements, he focused them out to create a walkway spanning through the rapids and up to the pillar.
As he saw his grand plan laid out before him, he tested the walkway and saw it was stable, yet crumbled slowly every time he used it.
And so he began to build, build up a structure to live on while he observed the wonderous world he'd been born into.