The world of Iosterra is huge, easily several times the size of Earth, and each region offers its own unique combination of peoples, monsters, and experiences, all tied together by the devastation caused by the Magister War and the Lost Era. Each region is presented with a collection of related articles about its residents, hazards, and treasures. Designed to be playable at any level, each region offers challenges for new and experienced adventurers alike. Broadly speaking, the world can be divided into the four main continents, which are simply referred to as the Northern, Eastern, Western, and Southern Continents. Between and around them are arrayed island chains, archipelagos, and subcontinents, many of which use "proper" names as opposed to simply using the cardinal directions. In the skies float skylands, floating islands ranging in size from a few hectares to hundreds of square kilometres, locked in place at altitude by unknown means and reachable only by magic, monster, or skyship. Scattered across each region are the remains of lost civilizations, engines of war, and the peoples who call these places home.