Syntryl

A legendary island located in the middle of the Syn Sea in western Vivilim. It was an artificial island created by a race of aquatic pale skinned humanoids known as the Syntrylyns. They peacefully lived upon the island for thousands of years with no outside contact... That was until they were discovered by the Vivilese who settled west. They mostly made peace until the rule of the madman of Suspary who poisoned the Syn Sea which made the entire civilization die out and the island famously shriveled and sunk.

Many generations later it is mostly seen as myth or legend. But some believe the island will rise up again and carry the Syntrylyns once more...