Border Coverage is the complete distance of shared borders for a given nation. Borders become important in forging alliances and managing incoming/outgoing road/foot traffic. In times of war, borders become increasingly important for the home guard to defend. For the purposes of the GFP ranking, lengthy shared borders requires a greater material and financial commitment to national security.
The values below are displayed in Kilometers (km). Island nations (ex: Australia) are not included in this list nor penalized for lacking shared borders.
Sources: US Library of Congress; CIA.gov/CIA World Factbook; EIA.gov; wikipedia.com; energy.eu; SIPRI.org. Some values estimated based on factors available when official sources are lacking.
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