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This is his famous World Map available as a poster from Athene. Interestingly it says Terra Australis nondum cognita which translates as The Land Australia not yet known.
Australia was given the Name New Holland in 1644 by Abel Tasman and it stuck for 180 years. You see it on our globe in the library. In 1804 Matthew Flinders gave it the name Australia and it was finally approved in 1824. The name Australia came from Ptolemy. He speculated there would be a large land mass in the south to balance that in the North and he named it Terra Australis Incognita – the Unknown South Land and that is what Ortelius has adopted.