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: CIA.gov, CIA World Factbook, wikipedia.com, public domain print and media sources and user contributions. Some values may be estimated when official sources are lacking.