Canada has the world’s longest coastline, measured by standard national geographic estimates.
Canada’s coastline is commonly given as about 202,080 kilometres, including shores along the Atlantic, Pacific, and Arctic oceans. The figure is especially large because Canada includes an extensive Arctic archipelago, with thousands of islands and deeply indented shores. Coastline totals can vary depending on map scale and measurement method, but Canada remains the accepted national leader.
Canada also borders the world’s longest international land boundary, shared with the United States. Its maritime geography includes Hudson Bay, the Labrador Sea, the Beaufort Sea, and the Northwest Passage. The country’s northern coastline is strongly affected by sea ice, while the Pacific coast includes fjords and mountainous islands.