Sesachacha Pond is one of the largest ponds on the island with a large sandy barrier beach that separates it from the Atlantic Ocean. The barrier beach is cut open once or twice a year allowing the ocean to flow into the pond. Nature's way of keeping the pond healthy and vibrant. A great place to enjoy a sunrise, catch a fish, paddleboard, sail or just relax with a good book. -- while enjoying your Nantucket vacation home or rental.