The Western Sea is the great ocean due west of Tirannwn, bordering the known world of Gielinor. Not much is known about the sea, apart from the large continent which houses Great Kourend, which is quite a distance from the mainland and the two minuscule isles that are closer to the shore. Players briefly traverse it when sailing on a charter ship to or from Port Tyras and Piscarilius House.

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