Which is the largest coastline?

The longest coastline in the world belongs to Canada. Canada has a coastline of over 243,000 kilometers (151,000 miles). This is longer than the coastlines of the United States, Russia, and China combined. The Canadian coastline is so long because of the country's vast size and geography. Canada has a large number of islands, peninsulas, and bays, all of which add to the length of its coastline.