Pacific Ocean
The Pacific Ocean was an Earth ocean that bordered North America, South America, Asia and Australia. The island of Salutua was located in the Pacific, as was the port of Honolulu. (PROSE: The Eye of the Giant)
In 1770, the First Doctor, Susan Foreman, Ian Chesterton and Barbara Wright met Captain James Cook aboard the Endeavour while it was sailing the Pacific Ocean. Shortly afterwards, the TARDIS was lost at sea but was eventually recovered. (AUDIO: The Transit of Venus)
American fighter pilots encountered Light-beings in the Pacific during World War II. (PROSE: Endgame)
In the 1970s, the Third Doctor briefly materialised on the bottom of the Pacific Ocean while attempting to go to Bombay. (PROSE: Island of Death)
By 2050, an alliance known as the Pacific Union was active. It was presumably based around the Pacific Ocean. (TV: Lost Library of Ukko)