Blackwater Bay

Blackwater Bay is a body of water on the east coast of Westeros, an inlet of the Narrow Sea. The great city of King's Landing sits on Blackwater Bay at the mouth of the Blackwater Rush.

In the books
In the Song of Ice and Fire novels, Blackwater Bay is a fairly large body of water, held between the arms of Crackclaw Point to the north and Massey's Hook to the south, with the island of Dragonstone guarding the entrance to the bay. Elements of the King's Fleet patrol the Bay and ensure it is kept free from piracy.

Aside from King's Landing and Dragonstone, the largest port on the bay is Duskendale (which serves as a secondary port for King's Landing when the main port is overwhelmed with traffic), whilst the largest island is Driftmark, the seat of House Velaryon.