D&D 3.0: Tales from Mystara
Mount Talaroa is an active volcano located on Aloysius Island of the Archipelago of Ierendi. The place has a few ruins of unknown origin specially in the swamp that is located at the base of the volcano.
Strange lizardmen artifacts are sometimes found in the swamps near the volcano; there are rumors of an entire lizardman city buried under the swamp, though it would be hard for anyone to find this out.
Recently, bands of lizardmen has been attacking the local humans and hiding in the Mount Talaroa’s swamp.