The eastern part of the island is more densely populated by the permanent residents, and is the area mostly visited by the summer visitors, who have bought up almost the entire north-east shore. This heavily populated end of the island is generally referred to as Down-island. The western third of the island, where most of the original inhabitants of the island live, is known as Up-island. It is strictly rural, with a few villages and salt ponds, marshes, and uninhabited pine barrens. One area of Up-island is an area known as Chilmark, which formed the centre of the island's fishing activities, having once been a prosperous centre of the whaling industry.