L'océan Pacifique, qui s'étend sur une surface de 166 241 700 km2, est l'océan le plus vaste du globe terrestre. Il comprend entièrement l'Océanie et quelques autres îles et archipels qui traditionnellement font partie de l'Asie (Japon, Philippines, Insulinde). Il est entouré par l'Asie, l'Australie et l'Amérique, alors que sa limite avec l'océan Austral au sud est officiellement marquée au 60e degré de latitude sud. La ligne de changement de date le traverse aux alentours du 180e méridien.
Endeavour Reef is a coral reef within the Great Barrier Reef. The reef is about 7 kilometres (4.3 mi) long and runs in an east-west direction. The center of the reef is located at . It is about 6 kilometres (3.7 mi) south-east of the Hope Islands in the Hope Islands National Park and 12 kilometres (7.5 mi) off the mainland.
It was encountered by Lieutenant James Cook when HM Bark Endeavour ran aground there on 11 June 1770. In his journals, Cook described striking the south-eastern end of the reef at 11pm after having passed just north of Pickersgill Reef about one hour before.
Philip Parker King described the region in his Voyages for the Survey of the Intertropical coasts of Australia Volume 2 following his expeditions between 1818 and 1820. King described the reef as being "... nine miles long; it lies in a North-West direction; the north end, in 15 degrees 39 minutes South, bears due from the North-east Hope." and stated that there was a dry rock on the western edge "... in latitude 15 degrees 39 minutes 55 seconds." It is probable that he was referring to Claims Reef which is further to the north.