From the back cover:
Mystery and Madness Await
Join the struggle to save the cradle of humanity from monstrous and alien overlords. Venture to the frozen land of the shifters to make your fortune, or smuggle exotic goods and strange dissidents from a freewheeling southern port. Stand on the world's tallest mountain, or rove the vast wilderness that makes up the empire of Riedra. Seek venerated masters, and learn powers an abilities unheard of in Khorvaire. Come to Sarlona, ancient homeland of couatls and fiends, and explore a lands of lost empires and esoteric arts.
Inside this book, you'll find everything you need to explore the enigmatic continent of Sarlona:
Comprehensive overview of Sarlona's nations, including their governments and relations, as well as locations, communities, organizations, and MPCs.
Detailed maps of the continent, nations, settlements, and adventure sites
Unique new feats, magic items, prestige classes, psionic powers, and spells* Bizarre monsters and templates unique to Sarlona
Expanded by;
Secrets of Sarlona Character Backgrounds
Secrets of Sarlona Class and Character Themes
The Town of Ardhmen