11/03/2026
Quick geography question: which country shares the longest land border with France?
If you said Spain, you're in good company, and you're wrong, but only by a little. France's longest land border is in South America, between French Guiana and Brazil. The CIA World Factbook puts it at about 418 miles (673 km). The border with Spain comes second at about 401 miles (646 km). Some sources list the Brazil border closer to 730 km, so Brazil comes out on top either way.
French Guiana often gets called a colony, and it was one until 1946. That year it became a full department of France, with the same status as any department on the mainland. People there are French citizens, it's part of the European Union, and it uses the euro. It's also where Europe launches its rockets, from the spaceport at Kourou. A bridge over the Oyapock River links it to Brazil by road.
Filmed at World Maps Online, our map workshop in Seattle, where we print the maps you see in these videos.
Share this with someone who'd guess Spain.