|from Subterranean Design|
I wanted to share this picture of a circular wall built in a pond because a similar structure figures prominently in the Paul Jaquays classic module Realm of the Slime God, a.k.a. Night of the Walking Wet. This adventure originally appeared in two parts in Dungeoneer #6 and #7 and was reprinted in the Dungeoneer Compendium. In my opinion the Compendium is one of the best products released for OD&D, ranking right up there with the Arduin Grimoire and Judges Guilds' Ready Ref Sheets.
Anyway, it's neat to see a real version of the weird reservoir-built-in-a-lake structure from that adventure.