New Holland (Dutch: Het Niew Holland or Nieuw-Holland) is a historical European name for mainland Australia, first encountered by Europeans in 1606, by Dutch navigator Willem Janszoon aboard Duyfken. The name was first applied to Australia in 1644 by the Dutch seafarer Abel Tasman, and for a time came to be applied in most European maps to the vaunted "Southern land" or Terra Australis even after its coastline was finally explored.
The continent of Antarctica, later named in the 1890s, was still in largely speculative form; it resumed the name Terra Australis (sometimes suffixed Non Cognita, lit. 'unknown'). Its existence had been speculated on in some maps since the 5th century, under the theory of "balancing hemispheres".