Yes, you can freely travel between both the Dutch side (Sint Maarten) and the French side (Saint Martin) of the island. There is no physical border control, customs, or passport check when moving between the two; in 2026, the border is marked only by small welcome signs and flags, symbolizing over 350 years of peaceful coexistence under the Treaty of Concordia. You can have breakfast in the Dutch capital of Philipsburg and drive 20 minutes to have lunch at a French bistro in Grand Case. However, you should be aware of a few practical differences: the Dutch side uses the Netherlands Antillean Guilder (though the USD is accepted everywhere), while the French side officially uses the Euro. Additionally, cell phone roaming might switch between networks, and the "vibe" changes from the Dutch side's bustling casinos and cruise ports to the French side's laid-back beaches and "gastronomy capital" reputation. It is one of the few places in the world where you can experience two distinct European cultures on one small Caribbean island without ever showing a travel document.