Long-running coastlines can provide a vulnerable position for a nation regarding invasion from the sea.
Coastline Coverage is the complete coverage of land access to open deep water sources. Lengthy coastlines require a larger financial and material commitment concerning self-defense and, as a result, many nations have developed amphibious assault forces and specialized coastal patrol craft to minimize a concentrated attack from the sea. For the purpose of the GFP ranking, a lengthy coastline coverage requires a heightened commitment to self-defense and, as such, island nations are particularly vulnerable.
Values below displayed in Kilometers (km). Land-locked nations, such as Austria, are not penalized for lacking a coastline.