The Aberrant Mark
Six continents support he vast diversity of live on Eberron. One of these, Khorvaire, is the heart of the world, at least as far as humans are concerned. On this continent, the last and greatest of the human empires grew and thrived before the Last War tore it asunder. Most player character are from Khorvaire, since members of most of the races of Eberron can be found there.
Humanity’s great nations were once on, then five, and now four: scholarly Aundair, militaristic Karrnath, theocratic Thrane, and cosmopolitan Breland. These four kingdoms, together with a dead nation once called Cyre, occupy central Khorvaire. In addition to being home to humans, the nations are melting pots of other cultures. Dwarves, elves, halflings, dragonborn, half-elves, and less common races make their homes in the towns and cities of the ventral nations. Warforged are a particularly common sight-House Cannith’s humans fashioned this race in their arcane creation forges.