Countries with the Longest Coastlines

Data

Source: Wikipedia — List of countries by coastline length (CIA World Factbook data).

Note: What You Should Know About the World's Longest Coastlines

Coastlines are one of those things everyone can picture but hardly anyone measures the same way. A coastline is simply the boundary where land meets the sea, but figuring out exactly how long that boundary is turns out to be surprisingly tricky. That's why the numbers on this page are best thought of as careful estimates rather than perfect counts. Let's break down what these figures really mean and why some countries land so much higher than others.

What coastline length actually measures

• The coastline is the total length of a country's shoreline where its land meets the ocean — along mainlands AND every island that belongs to that country.
• It's measured in kilometres (and miles). Here Canada comes in at a staggering 202,080 km, with Indonesia a distant second at 54,716 km.
• Every bay, inlet, peninsula, fjord and island adds to the total. The more "wiggly" a shore is, the longer it measures.
• A country can have a huge surface area but a relatively modest coastline, while a small, jagged nation can rack up an enormous one.

Why it's so hard to measure precisely

• The famous coastline paradox (coined by mathematician Benoit Mandelbrot) shows that the closer you "zoom in", the longer a coast becomes.
• Measure with a giant ruler and you skip the small bays; measure every tiny rock and cove and you add thousands of kilometres.
• Tides change the water line daily, so the "true" boundary is never completely fixed.
• Most national figures (including the CIA World Factbook numbers used here) rely on a standard map scale, which is why they seem so neat — they reflect one consistent method.
• Databases can disagree by a lot for the same country, simply because they use a different level of detail. So always treat these as relative rankings, not exact physics.

Who leads — and why

• Canada (202,080 km) is the runaway winner — nearly six times longer than Indonesia. Its Arctic archipelago alone holds tens of thousands of islands.
• Indonesia (54,716 km) is a massive island nation — over 17,000 islands — so its coast is inevitably enormous.
• Russia (37,653 km) and the Philippines (36,289 km) round out the top, both stretching across huge, island-and-coast-rich territory.
• Japan (29,751 km) and Australia (25,760 km) benefit from being island nations whose entire perimeters are shoreline.
• Norway (25,148 km) is the classic trick of geography: a relatively modest mainland, but its deep fjords and cliffs make the shoreline appear incredibly long.
• Islands are the single biggest multiplier. Countries made up of thousands of islands out-rank many much larger landmasses.

Quick tips for reading this chart

• Compare countries within the same source — mixing datasets with different measurement scales undermines the comparison.
• Notice the drop from Canada to Indonesia: the top two are separated by a huge gap, while the rest of the field is much tighter.
• Think about geography first: island nations almost always rank above continental giants by coastline, even when their land area is smaller.

Fun facts

• Canada's coastline is roughly six times the circumference of Earth (about 40,075 km) and long enough to wrap around the planet nearly five times.
• If you could walk the entire figure at a brisk 5 km/h non-stop, Canada's 202,080 km would take about 4 years of continuous walking.
• Norway ranks in the top seven largely thanks to its fjords — estimated to total thousands of kilometres of shoreline.
• Greece (13,676 km) manages to crack the top ten mostly through the thousands of islands scattered across the Aegean and Ionian seas.

So the next time you see a "longest coastline" list, remember: it's a snapshot, not a perfect answer. The scale, the mapping method and the islands all shape the result — but the big-picture story is clear. Canada dominates, island nations punch far above their weight, and rugged, fjord-lined countries like Norway turn every curve into extra kilometres.