Total land-border length sums every kilometer of a country's land boundaries. China holds the record at roughly 22,457 km. Russia is second at around 22,408 km. India, Brazil, and the United States round out the top five.

Quirks of the metric

Argentina has one of the longest single land borders in the world: 5,308 km with Chile, defined almost entirely by the Andes ridge line. The shortest international land border in the world is the 85m strip between Gibraltar and Spain. Island nations have zero land border length. Saudi Arabia and Yemen completed border demarcation only in 2000 after a century of dispute.