An imaginaty or supposed continent that showed up on European maps between the 15th and 18th century: Terra Australisis is also known as, Terra Australis Incognita, Latin for "the unknown land of the South".

It was introduced by Aristotle. Aristotle's ideas were later expanded by Ptolemy, a Greek cartographer from the first century A.D., who believed that the Indian Ocean was enclosed on the south by land.