Ocean waves come in many shapes and sizes, but one particular formation called “square waves” can be a warning sign for swimmers and surfers alike. Experts advise that if you notice square-shaped waves forming in the ocean, it’s important to exit the water promptly to ensure your safety.

Square waves, also known as cross seas, occur when two different wave systems intersect at nearly right angles, creating a distinctive grid-like pattern on the water’s surface. This phenomenon can make the ocean unusually unpredictable and dangerous.

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