The Sea of Swords is a body of water in the Forgotten Realms campaign setting of the Dungeons & Dragons fantasy role-playing game, located off the Sword Coast in the northwestern part of Faerûn. The Moonshae Isles forms the sea's western boundary while the Nelanther Isles and the Tethyr Peninsula defines its southern extent. The sea has no exact northern border, but it is clear that the border is north of Waterdeep.
The sea is named for its numerous pirate attacks upon the shipping route extending from Waterdeep in the north, to Calimshan in the south. Piracy in the region is rampant despite the efforts of the natives of various Sword Coast ports and pirate hunters.
Ships operating in the Sea of Swords often carry on trade between the ports of Luskan, Neverwinter, Waterdeep, Baldur's Gate, Athkatla, Murann, Velen, Zazesspur, Myratma, Memmon, and Calimport.