The Iron Islands are somewhat isolated from most of the Seven Kingdoms, as it is surrounded by the sea. You can recognize the Iron Islands by its grey colour.
The Iron Islands have long been home to the followers of the Drowned God, pillaging and looting along the coastlines of the known world in their Great Reavings. They believe in paying the 'Iron Price' and not the gold price, meaning that you must take what you want by force, not by money.
Traditionally ruled by House Greyjoy after they were elected by the Ironborn following Aegon's Subjugation of the Islands.