""Wilderlands of High Fantasy is a role-playing game campaign setting. It grew from the officially licensed D&D material from Judges Guild in the 1970s and '80s including The City State of the Invincible Overlord.
The original edition ran to a total of 18 half-continent sized maps (some dealing with ocean settings), with details of the cities, towns, islands and ruins/lairs to be found. The setting was then used as a locale for a multitude of modules and characters published by Judges Guild.""
Source: Wikipedia, "Wilderlands_of_High_Fantasy", available under the CC-BY-SA License.