Which of the major oceans is roughly the size of Antarctica

The Arctic Ocean is roughly the size of Antarctica.

Explanation:

The size of Antarctica is "14 million square kilometers" and the size of the Arctic Ocean is "14.06 million square kilometers". The continent and the ocean lie in two different hemispheres. The continent in the "southern hemisphere" whereas the ocean in the "northern hemisphere". These two entities form the two end caps of the Earth's spherical heads at the top and at the bottom.