Blackwater Bay
Blackwater Bay is a large bay on the east side of Westeros. It is located in the Crownlands where the Blackwater Rush meets the Narrow Sea. The capital of the Seven Kingdoms, King's Landing sits on the mouth of Blackwater Bay.
Notable events
The Battle of the Blackwater occurred on the mouth of the bay. This battle pitted the forces loyal to Stannis Baratheon against those loyal to Joffrey Baratheon. Tyrion Lannister, the King's Hand at the time, devised a system with a chain boom pulled across where the river widens into the bay. This chain was raised once the majority of Stannis' fleet was up river and wildfire was deployed to ignite many of the ships. The current pulled these burning ships towards the bay and against the chain, which resulted in the destruction of much of the fleet.