Which country has the largest coastline in the world?
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When identifying countries with the longest coastlines, consider the geographical size and location of the country. Russia, due to its vast size and location, has the largest coastline in the world.
The country with the largest coastline in the world is Russia. The total length of Russia's coastline is approximately 37,653 km, which is the longest of any country.
Answer: \(\boxed{B}\)