Ibben (sometimes called Ib) is a cold, mountainous island. It lies in the Shivering Sea to the north of the Free Cities. Its major city is the Port of Ibben. Reportedly, beyond the Port of Ibben, the main city, lie cold wastes where one can find mammoths.
The Ibbenese people live mostly on the cold, mountainous, Iceland-sized island of Ibben, and a couple much smaller ones in the Shivering Sea, with few colonies on the eastern continent. They are whalers, who live of the large population of whales in the Shivering Sea. They pilot Fat-bellied whaling ships, hulls black with tar and sometimes reach as far as King's Landing for trade  The men of the Port of Ibben are usually described as hairy and squat, with rasping voices (IV: 508) who chew blubber. They are fond of axes and carry shaggy brown shields. 
Behind the scenes
Martin described Ibben as being the size of Iceland.
References and Notes