| Category | Cities |
| Location | Buccaneer Archipelago |
| Owner | unknown |
| Population | unknown |
| Map | Baradyan |
Situated near the heart of the Buccaneer Archipelago lies the legendary subaqueous metropolis of Hydraxion.
The depths of Pearl conceal a marvelous city, home to thousands of chests from sunken vessels. The locale is unearthly, constructed by tritons and marids to serve as a stronghold for Poseidon.
pirate tale, "The Gilded Halls of Hydraxion"
Hydraxion bears more resemblance to a tall tale than to established fact. Curiously, the scant information available on this enigmatic location was discovered within the kuo-toa city of Shoglomph. The sole remaining member of the adventuring party known as the Sons of Drog succeeded in relaying this data back to civilization before succumbing to their fate and transforming into a kuo-toa tadpole.
The jade rune plaques of the kuo-toa depicted Hydraxion as a coral metropolis, possessing the capacity to traverse the oceans, generating air pockets for guests or captives. The city's reported treasures include coffers of orkulten pearls and exquisite items from the deep, such as luminant coral.