D&D 3.0: Tales from Mystara
Aleea Reef is a series of dangerous reefs on Ierendi Archipelago located south of Ierendi Island. There is an area just between the Takala Reefs and the Aleea Reefs deep underwater that connects the two reefs and is called the Red Coral Forest. The Aleea Reef is located south of Aleea Bay and west of Royster Trench.
This place is home to the underwater village of the Aleea Merfolks who, from time to time, lure sailors unto their dead to steal their treasures. These ships attacked are usually pirates enemy of Ierendi as the Aleea Merfolks have a pact of mutual protection with Ierendi.