Country Borders Lookup: Which Countries Border Each Other and For How Long?

How this tool works

Border adjacency and lengths are precomputed by walking every country boundary and matching shared segments between neighbors, then averaging both sides. Pick a country to see its neighbor list sorted by border length, plus its approximate total land border.

What you can do with it

• Look up all neighbors of any country instantly
• Compare border lengths, like which US border is longer, Canada or Mexico
• Find the countries with the most neighbors (China and Russia, 14 each)
• Get approximate total land border lengths for any country

Why use it

Which countries border X is a constant reference need for quizzes, articles, and homework, and border lengths add the dimension most lists omit. Precomputing from one consistent dataset makes every country comparable.

Data sources and methods

• Natural Earth (public domain map data)

Coverage note: Lengths come from simplified boundaries and are approximations; official figures vary between sources because borders are measured at different resolutions.

Related tools