What are the three sister islands in Fire and Ice?

The Three Sisters Island is located in Bite Bay, and the Northern Territory and the Valley are fighting for these three islands. When the Northern Territory lost interest in these three islands, they nominally belonged to the valley. The inhabitants of the island are pirates, and the most powerful one once occupied the area of Baigang in the north. Lighthouses are often used to guide ships to hit rocks and make a fortune. Robert's uprising and the battle of the five kings were all about soy sauce. When Ned returned to the north and called the vassal and the onion knight to White Harbor, they were all there because of the storm, and all the lords spared them with the rhetoric of "even if they failed".