Twofold Bay is an open oceanic embayment that is located in the South Coast region of New South Wales, Australia. The bay was named by George Bass, for its shape of two bights. The northern bight is called Calle Calle Bay; while the southern bight is known as Nullica Bay. The bay is also known for the "Killers of Eden", the killer whales that helped a group of whalers in their search for other whales. The best-known of these was Old Tom, whose skeleton is preserved in Eden's local museum.