Nova Scotia is Canada's second-smallest province in area, after Prince Edward Island. The province's mainland is the Nova Scotia peninsula, surrounded by the Atlantic Ocean and including numerous bays and estuaries. Nowhere in Nova Scotia is more than 67 km (42 mi) from the ocean.[6] Cape Breton Island, a large island to the northeast of the Nova Scotia mainland, is also part of the province, as is Sable Island, a small island notorious for being the site of offshore shipwrecks,[7] approximately 175 km (110 mi) from the province's southern coast.