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, derived from Nalluccer, the original Aboriginal name for Twofold 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. Location and features Located near the town of Eden, Twofold Bay is approximately to the north of the border between Victoria and New South Wales. The bay is fed from the Nullica River and Towamba River that both flow into Nullica Bay. The catchment area of the bay is with a volume of over a surface area of , at an average depth of ; making the bay reputedly the third deepest natural harbour in the Southern Hemisphere. Close to North Head is a conspicuous islet, Mewstone Rock. About south of the islet is Red Point which forms the southern headland of the bay. Eden and the Port of Eden are located in the bay. The historical town of Boydtown is located to the west of the bay, located on Boydtown Beach which stretches south from the mouth of the Nullica River. Local waters including Twofold Bay are recognized as one of twelve coastal aggregation areas for southern right whales in Australia. History Indigenous history The original inhabitants of the area surrounding Twofold Bay were Aborigines of the Thaua or Nalbker clan of the Yuin nation. European history The first recorded visit to the bay by a European was by George Bass. The diaries of Bass show that he noted the bay when he passed it on his whaleboat voyage to Bass Strait in 1797/8. Bass took shelter in the bay on the return journey in February 1798; and named the place where he sheltered "Snug Cove", a name by which the bay is still known. On 7 October 1798 Bass and Matthew Flinders set out from Port Jackson in the Norfolk on a voyage to determine whether or not Van Diemen's Land (now called Tasmania) was attached to the mainland of Australia. Accompanying them on this voyage was the