France & Netherlands Share Only One Border: Saint Martin (Caribbean)

The sole land border between France and the Netherlands is on the Caribbean island of Saint Martin / Sint Maarten.

The Island

• North (53 km²): Saint-Martin — French overseas collectivity (EU, euro)
• South (34 km²): Sint Maarten — Dutch constituent country (Kingdom of NL, not EU, uses guilder/USD)

The Border

• Length: ~16 km (10 mi)
• Character: Unmarked, unfenced, crosses roads, beaches, backyards.
• Crossing: Free movement (Schengen-style de facto). No passport checks.

Unique Trivia

• Smallest landmass shared by two sovereign nations.
• Only place where France & Netherlands border anywhere on Earth.
• Princess Juliana Airport (SXM) runway ends at Maho Beach—planes land 10m over sunbathers.
• Dual nationality common; many residents hold both French & Dutch passports.

Not to be confused with: Saint-Barthélemy (French, separate island), Saba/Statia (Dutch Caribbean, separate).