What Carol sais is correct. passport must be valid for the duration of your trip if you arrive in the Dutch side and 6 months past your trip if you arrive in the French side. We arrived in the Dutch side. a few days later we went to Marigot and took the ferry to Anguilla. After returning from Anguila at the Marigot customs the officer was checking my passport. I curiously asked what is he looking for? He said he was making sure my passport is valid at lest for another 6 months. So this was upon returning to St. Martin from Anguilla.

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