Some fans argue that the dòng-specific regions of the North, the Iron Islands, and the Riverlands could be considered separate kingdoms. This would bring the total number to 9, with the additional two being the Kingdom of the Isles and the Rivers. It's a theory that's gaining traction, especially among book readers who've noticed some subtle hints in the novels.
One of the main arguments for the 9-kingdom theory is that the Iron Islands have a distinct culture and history, which sets them apart from the rest of the Seven Kingdoms. They even have their own king, the Lord of the Iron Islands, which further supports the idea that they could be a separate kingdom. It's a fascinating topic to explore, and one that highlights the richness and complexity of the Game of Thrones world.