From publisher blurb:
Welcome to the world of Kos and to Lands Beyond Kos, the second volume of the highly-anticipated Swords of Kos Fantasy Campaign Setting!
This book contains detailed descriptions of 16 different nations and brief descriptions of nine regions that can be used either individually or in conjunction with one another, and within the context of the Kos campaign setting or as part of any other milieu a storyteller might have established. It also includes a fully-keyed map of the region, both in the book and as a separate 11 x 17 file that can be printed out on a single sheet of paper.
The Swords of Kos Fantasy Campaign Setting has deliberately been designed to be system free, not tied to any particular game setting, and to be compatible with any set of role-playing game rules suitable for ancient, medieval, or fantasy venues. In that the setting was used as the playtest backdrop for games using the OGL/d20, Pathfinder, “Basic” Dungeons & Dragons and Labyrinth Lord retroclone, and Advanced Dungeons & Dragons rules, of course, it is an especially ideal setting for them.