Baie Longue (also known as Long Bay) is the longest and arguably most tranquil beach on Saint Martin. Stretching for nearly 1.5 miles along the exclusive Terres Basses (Lowlands) district on the French side of the island, it is a stunning expanse of pristine white sand and crystal-clear turquoise waters. Because it is tucked inside an upscale residential community and has virtually no commercial development, it offers a peaceful, secluded getaway that feels entirely cut off from the busier parts of the island