The Sea of Fallen Stars, also known as the Inner Sea, is the largest inland body of water in Faerûn. Its major areas include the Dragonmere, also known as the Lake of Dragons, in the west; the Dragon and Easting Reaches in the north; the Alamber Sea in the east; and the Vilhon Reach in the south.
The sea serves as a crucial trade way for the powers of central and northern Faerûn and beyond. From Cormyr’s Imperial Navy and Sembia’s 15,000 sailors and corsairs in the west, to the small but hardy fleet of dozen Impilturan warships in the east, and the militia-navy of Turmish in the south, the waters of the Inner Sea are well-travelled by ships that fly the flags of coastal nations in central Faerûn.
The sea is large enough to feel tidal effects, and hundreds of shipwrecks cover the sea floor.