Artificial Structures:
Also varied, and also futile to detail on this page.
Climate:
The Heartlands has a temperate climate and a sub-tropical climate, getting warmer the closer one gets to the Rim.
Politics:
The fifty plus nations of the Heartlands live in a more or less feudal society with each other. There are regular border disputes, as to be expected, but armed conflicts are put down in favour of diplomatic solutions.
Trade:
Trade with other Heartlanders is much more common than trade with other discs. The Heartlands is so massive that six specialized Ivory Gates - Hearth Portals, they are called - link points on the same disc to each other for ease of transport.
Zoology:
The animals native to the Heartlands are remarkably varied, but one thing stands out about wildlife on this disc, and that is the surplus of faerie creatures such as unicorns and pegasi.
Botany:
The plant life of the Heartlands is equally varied.