Sure, in the 2e book Tales of the Lance: World Book of Ansalon, pg 55-56. I just had another read, the sea barbarians are listed as descendants of mariners from Istar. I've copied the relevant sections below for the sea barbarians. Lifestyle looks like it has some info on where they maintain some more permanent settlements. I always thought of them as the archetype for the mariner warrior class, probably helped along by the art used in the book.
Appearance
Sea barbarians have richer skin tones than other barbarians. Their skin ranges from light brown to glowing black. They wear their tightly curled black hair closely cropped to their heads. Their eyes flash with emotion—joy one moment and wrath the next—much like the volatile sea. Sea barbarians enjoy flamboyant and gaudy garb of sailcloth, homespun, or burlap. Life among the roaring billows and pitching waves makes these folk boisterous and courageous. Even so, they are the most civilized of the barbaric races.
Personality
Sea barbarians differ greatly from their barbarian brothers. On the outside, these loud, friendly people brim with good cheer. Underneath, though, sea barbarians harbor a haughty pride that keeps them distant from other races. Even so, sea barbarians deal fairly with those they meet and, given time, develop friendships that can weather any storm.
History
The sea barbarians have an entirely different history. They arose as mariners of once-mighty Istar. The Cataclysm destroyed the heart-city of their shipping business and dispersed the mariners throughout the world. Since the Zero Hour, mariners have led a somewhat nomadic existence. They never settle permanently: the urge to travel fills their blood.
Lifestyle
The sea barbarians live differently. Although they spend most of their time at sea, they do dock occasionally. Descendants of city dwellers, these barbarians maintain port cities where they can rest and sell their cargos. The city of Sea Reach on the island of Saifhum is one such bedroom town for sea barbarians. They forbid foreign traffic into Sea Reach, wishing to keep the foul folk of Ansalon at arm's reach.