Sharp Point is a castle in the Crownlands, the region controlled directly by the Iron Throne in King's Landing. The castle is located north of Stonedance, at the end of a peninsula where the southern portion of Blackwater Bay meets the Narrow Sea.
In the books
In the A Song of Ice and Fire novels Sharp Point is located at the end of Massey's Hook and is the seat of House Bar Emmon, a noble house sworn to Dragonstone. The castle is a large watchtower upon which a great fire burns atop.