Simpson Bay Lagoon

Simpson Bay Lagoon is a large lagoon in the west of the Caribbean island of Saint Martin. The border between the French and Dutch halves of the island runs across the centre of the lagoon. Two small islands lie in the lagoon, the larger, to the north, is within the French region of Saint-Martin, the smaller, to the south, is within Dutch Sint Maarten.

The lagoon is connected to the Caribbean sea via a small channel to the north, which flows into Baie Nettlé in Saint-Martin. Sint Maarten's airport, Princess Juliana International Airport lies close to the lagoon's southern shore.