The hidden borders of the lost continent ‘Zealandia’ have been revealed in incredible detail

A new ocean mapping expedition draws the borders of Zealand, the submerged “lost continent” that hosts New Zealand and the territory of New Caledonia in the South Pacific.

Zealand separated from the supercontinent of Gondwana between 79 and 83 million years ago. Apart from New Zealand and New Caledonia, this fragment of the continental crust is now at the bottom of the ocean. It is not the only part of the continental crust that has separated from the larger continent, but it is the largest with 4.9 million square kilometers of 1.9 million square kilometers. It is six times larger than the next largest continental fragment, the microcontinent of Madagascar.