Sunfall Isle is located in the western reaches of the Sea of Kings, sitting just across the Strait of Sunfall from the Silvery Peninsula. It is the largest island in the Sea of Kings and falls under the Provincial territory of the Sunfall Isles in the Holy Empire of Acolytius. The city of Brunswick Port is located on the island's northeastern coast.
As the capital of the Sunfall Isles is located on the island, its population has grown quite significantly. Its history of seafaring and excellent conditions for sailing have brought many people to its shores. Outside of Brunswick Port, the island is blanketed in sparse forests and coastal plains.