We've learned about four other oceans so far,
in order of largest to smallest they are:
Pacific, Atlantic, Indian and Southern oceans.
The last one is the Arctic ocean
It's the ocean at the very top of the earth, where the North Pole is.
![arctic ocean](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/IBCAO_betamap.jpg/421px-IBCAO_betamap.jpg)
(from: wikipedia - arctic ocean)