Coastal Cave Complex
from the cover:
The Sea Cave is a haunted cliff cave famous on the coast and shunned by good folk.
But many have heard tales of secret hidden treasure and riches. Every generation someone strikes it lucky. Many more simply vanish. Victims of the hungry Kraken or other terrible things inside.
An adventure location with random generation. The scenario notes are nominally compatible with older editions of D&D.
The PDF is designed to be printed and folded as a pocketmod.