The B'etha'ein Sea is a great body of water on the planet Centaurus IV. The ocean lies adjacent to the northern pole of the planet, and is bordered by northerly island continents Great Oreas and Tedimah'k and the polar continent of Ash'ayn. (Decipher RPG module: Worlds)

planet Centaurus IV
cities and settlements	Aquinasville • Caladia • Chandrik • Dora'an • Gorek • Ku'ltan • Lamenk • McIverton • Narva • New Athens • Second Try • Shadra • Tarala'n • Torus • Vehaxein
landmarks and geography	Columns of Ineti • Mount Fera'an • Nyrian Pyramids • Garrovick Valley
continents and landmasses	Ash'ayn • Avara • Bastal • Farain • Great Oreas • Kesta'al • Knu'fyr • Leroth Islands • Naroth • New America • New Asia • New Europe • Nyria • Shalaven • Tedimah'k
bodies of water	B'etha'ein Sea • Farragut River • Opal Ocean • Ral'einn Sea • Shima'ran Sea • Varan Sea • Varath Sea