From publisher blurb:
The Environs of Aufstrag is designed as an expansion to the world of Aihrde as found in the Codex of Aihrde. It is system neutral, usable with any game system. It includes terrain descriptions, history and adventure hooks.
These are the lands that surround the dread tower of Aufsrag. Once a verdant country ruled by the opulence of the Aenochians, they are now wild and overgrown, consumed by the swamps of the Grausumland, the dead plains of the Toten Fields and the Blighted Screed. They are the haunts of those shadows of Aufstrag who linger on in the world of AIhrde.
The Environs of Aufstrag explores all the lands around the tower of Unklar rule. It includes information on the few existing roads, the terrain, waterways, peoples and monsters. It includes most of the lands from the A series adventures modules.