World countries border blitz

1. [1]Central Intelligence Agency. The World Factbook, 2025 edition: Land boundaries (archived copy of the agency's page).
2. [2]United Nations. Member States.
3. [3]United Nations. Non-member States.

Note on the data. Land borders, land boundary lengths, coastlines and highest points are those of the CIA World Factbook in its last (2025) edition, read on 3 October 2026 from the archived copies of the agency's own field pages, parsed by script and checked to be symmetric. A border through a dependency (French Guiana, Gibraltar, Greenland, Ceuta and Melilla) or one that depends on a disputed status (Kosovo, Palestine, Western Sahara, the Golan Heights) is on a doubtful list and is never asked. A country brings in every border country the Factbook lists for it, except the pairs on Ribbia's list of doubtful borders (France with Brazil, Suriname and the Netherlands through its overseas territories, Spain with Morocco at Ceuta and Melilla, the borders of Kosovo and Palestine, and others), which are left out so no answer can be argued.

Last checked October 4, 2026