Halmahera!
The biome within the continent took up the same name, having been turned into a gigantic farm. It was created in the shape of a bird's nest, with a mountain range forming the ends of the nest.
Halmahera wasn't a single nest, but a series of concentric nests, each bigger than the previous, and enveloped over each other.
The mountain range curved inward at the top, serving as the boundary of the biome. It was a barrier of sorts, and running like veins within it were circuits transporting Prana. As the biome of Halmahera continues to draw in power from the Sunken Halmahera, the space within it continues to expand, horizontally.
Every expansion is done by creating the boundary, which is represented by the mountain ranges. At present, hundreds of such concentric mountain ranges cover the biome.
From the ground to the ceiling spans around two hundred kilometres, creating a vast world. The earth underground stretches for a thousand kilometres.
