Judges Guild - Wilderlands of the Fantastic Reaches (2nd or 3rd print)

From the web:

The fourth and final supplement in Judges Guild's Wilderness series. It details the villages, castles, citadels, lairs, islands, ruins, and terrain in a section of the Wilderlands of High Fantasy campaign setting. It consists of two 16-page booklets (one 32-page book in later printings) and two double-sided 17" x 22" maps:

Campaign Map #15: Isles of the Dawn
Campaign Map #16: Southern Reaches
Campaign Map #17: Silver Skein Isles
Campaign Map #18: Ghinor Highlands