Ooh old cartography I can actually call semi bullshit on this. Basically we knew about a fuckoff big landmass we now call Antarctica (then hypothesized to be Terra Australis) due to the ocean currents around it, but we kept fucking up its location for some reason. Misidentification of Antarctica got so bad that Australia was the most nothern part of it hence why the naming is wrong.

Also a lot of maps made Tierra del Fuego look like it was part of the at the time hypothesized Terra Australas, as I said the misidentification problem got real fucking bad at times. But yeah we knew there was a continent or somethijg down there we just couldnt get to the damned thing because it was too hazardous.