The island of Saint Martin (in the Caribbean) is uniquely shared between two nations: the northern half is French (Saint-Martin) and the southern half is Dutch (Sint Maarten). This division dates back to the Treaty of Concordia in 1648. Despite being two distinct territories with different currencies (Euro vs. Netherlands Antillean Guilder/USD) and different official languages, there is no hard border between the two sides, allowing tourists and locals to move freely back and forth. Sint Maarten (the Dutch side) is famous for its vibrant nightlife, casinos, and the legendary Princess Juliana International Airport where planes fly low over Maho Beach. The French side is known for its gourmet dining, "European-style" nudist beaches (like Orient Bay), and a more relaxed, boutique atmosphere. In 2026, it remains the smallest landmass in the world shared by two independent sovereign states.