Tianonnis is not the only inhabited world in the system; Seyavon, its moon, is populated as well. Tianonnis itself has a population of three billion, mostly Iorou and Tian, a variant race. Tianonnis has a diameter of approx. 9592.752 kdul (15503.806 km). The surface bears no water, but it is scattered with Tian Wells, pits with openings of up to a kilometer in diameter, with (generally) up to a dozen kilometers of depth before one reaches open water. The planet's terrain is divided: the flat lowlands bear plants, at least around the wells, but the air is not very breathable for Iorou or Humans, and dense; most of the population lives on rocky, steep-sided (Monument Valley-like) outcrops, devoid of vegetation and kilometers high, but with more breathable air. These outcrops are connected by