Hex 17.23 -- The Lake of Abominations

The first hex in the Populated Hex series, The Lake of Abominations includes an overview of Absalom, the continent on which the series is set, and is an introduction to the one hex format used by this series. Each hex cluster will contain a central 6-mile hex (in this case the titular Lake) as well as the surrounding six hexes, and will include lairs, encounters, features, as well as optional rules for use in B/X or OSR-style games.
 
This free, introductory pdf describes the eponymous lake, containing an island with a mini-dungeon, as well as the following optional rules:
A basic skill system.
Expanded rules for poisons.
Rules for collecting magic item components.