Inlet of the Pacific Ocean, southeastern coast of Queensland, Australia. It is 65 mi (105 km) long and 20 mi (32 km) wide, and it serves as the gateway to Brisbane. In 1770 British navigator Capt. James Cook named the bay (misspelling it) for the earl of Morton. The first settlement on the mainland was a penal colony established at Redcliffe in the early 19th century.