Only land borders were taken into account

Note: I considered French Guiana separately from France and Greenland separately from Denmark, also did not take into account the British bases in Cyprus, but included the TRNC.

Sources: IMF 2025 https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nominal))

https://en.wikipedia.org/wiki/List_of_countries_and_territories_by_number_of_land_borders