Sea Elf

Sea elves fell in love with the wild beauty of the ocean in the earliest days of the multiverse. While other elves traveled from realm to realm, sea elves navigated the currents and explored the waters of many worlds. Today these elves can be found wherever oceans exist, as well as in the Elemental Plane of Water.
Like other elves, sea elves can live to be over 750 years old.

-description courtesy D&D Sourcebooks/D&D Beyond