The country with the most extensive coastline in the world is Canada. Its coastline measures approximately 202,080 kilometers, which includes the coastlines of its many islands and territories. The vast expanse of coastline spans the waters of the Atlantic, Pacific, and Arctic Oceans, resulting in a diverse range of ecosystems and habitats. This extensive coastline is also vital for Canada's economy, facilitating trade, fisheries, and tourism, while providing numerous recreational opportunities for residents and visitors alike.