abstract | - Large amounts of dragonglass can be found on Dragonstone, but it isn't a precious or even particularly useful material, being too brittle to make weapons and too sharp to use in building. Otherwise, the only significant advantage of holding Dragonstone island is its strategic position, guarding the entrance to Blackwater Bay and King's Landing. While Dragonstone island itself is of no particular value, its command of the sea lanes passing into or out of Blackwater Bay, to and from King's Landing, give it an ideal strategic value. The Royal Fleet is stationed at Dragonstone island, from which it can effectively defend (or in time of rebellion, blockade) any approaches to the capital city.
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