This is the Natural Pool in Aruba.  We took a safari jeep tour of the Island to see this.  Is was absolutely breath taking.  The waves crash each time filling the pool up continuously.  My husband actually swam and snorkeled in it. We also saw the Natural Bridge and many other unigue features of the island. If you ever get a chance to visit Aruba I recommend that you take the tour.  The island is completely different from one side to the other.