Nova Scotia is one of the Atlantic province of Canada. Most of its land is a peninsula connected to Nova Scotia by only a narrow strip of land. Its eastern end is Cape Breton Island. The narrow Strait of Canso that separates the island from Nova Scotia's mainland is crossed by a highway. The coastline measures about a thousand miles. The rocky southern shore is broken by many inlets, which would raise the length of the coastline to more than 4000 miles if included in the total. The province has few rivers over 50 miles long, the longest being the Mersey and St Marys. The northwestern side of the province is bounded by the Bay of Fundy, noted for the world's highest tides.