Random Ocean Name Generator

How this random ocean generator works

Press Generate and you get one of five: Pacific, Atlantic, Indian, Southern, Arctic. Turn up the Number box and you can have all five at once, in a random order.

That is a short list, and the reason it is short is more interesting than any list could be.

The number was four a moment ago. Before that it was five. And an oceanographer will tell you it is one.

There is only one ocean

Start here, because everything else follows from it.

Water flows freely between every part of the sea. A drop off the coast of Norway can reach the coast of Chile. There is no wall, no gate, no boundary of any physical kind between the Atlantic and the Pacific.

The five we teach children are administrative. They are the basins we cut the water into so we can talk about it, and the lines between them run through open sea, drawn on paper by people in rooms.

Which raises a question. If the divisions are ours, on what grounds do we make them? Four of the five answer the same way: the continents put them there. The Atlantic is the water between the Americas and the Old World. The Indian is the water south of Asia.

Land makes the ocean. Except once.

One of the five is not defined by land at all

The Southern Ocean encircles Antarctica. Its southern edge is the Antarctic coastline. And its northern edge, the boundary that actually matters, does not touch a coast anywhere on Earth.

It is a line in the open sea at 60 degrees south, and it is drawn there because of a current.

The Antarctic Circumpolar Current runs west to east around Antarctica, all the way around, meeting no land at any point. It exists because roughly 34 million years ago Antarctica finished separating from South America and the Drake Passage opened, letting water run right around the bottom of the world for the first time.

It is that current, not a coastline, that separates the cold water around Antarctica from the warm water to the north. Cross it and the temperature, the salinity and the wildlife all change.

The marine biologist Sylvia Earle put it about as well as it can be put: it is the only ocean that touches three others, and the only one that embraces a continent rather than being embraced by them.

The fifth ocean was deleted in 1953 and put back

This is the part that surprises people.

The International Hydrographic Organization's first edition of Limits of Oceans and Seas, in 1928, included the Southern Ocean. So did the second, in 1937.

The third edition, published in 1953, removed it. A majority of member states saw no reason to distinguish the water around Antarctica from the southern reaches of the Atlantic, Indian and Pacific. So it stopped existing.

Then it came back, slowly, from several directions at once. The United States Board on Geographic Names began using it in 1999. The National Geographic Society formally recognised it on World Oceans Day in June 2021. The IHO now recognises the Southern Ocean with its northern limit at 60 degrees south.

So: an ocean that existed in 1928, did not exist in 1953, and exists again now. Nothing happened to the water.

The current that holds it in place

The Antarctic Circumpolar Current is the largest ocean current on the planet, and the numbers are hard to hold in your head.

It carries somewhere around 137 million cubic metres of water every second. That is roughly a hundred times the flow of every river on Earth added together.

It runs about 21,000 kilometres, which makes it the longest ocean current there is, and it never reaches an end, because it chases and rejoins itself.

And it does something important. By fencing off the warm water to the north, it keeps Antarctica cold. The ice sheet exists because the current exists. Before the Drake Passage opened, Antarctica had forests.

One, four, five or seven

Every one of these answers is defensible.

Seven. Count the North and South Atlantic separately, and the North and South Pacific. People do. The phrase "the seven seas" is older than any of the modern oceans and has meant something different in every century that used it.

Four. Refuse the Southern Ocean, which is what most atlases printed until very recently and what many still print.

Five. The current consensus, and the one most people arrive looking for.

One. Take the oceanographers at their word and look at the water rather than the labels.

The water does not care. It has been circulating for a hundred million years and it will keep circulating long after the last committee has voted on what to call the parts of it.

Ways people actually use this

• Quizzes. Ask for all five, then ask which one was invented most recently. Nobody guesses.
• Teaching. The Southern Ocean is the clearest example anywhere of a boundary defined by a process rather than by a thing.
• Random assignment. Five buckets, evenly weighted, which is wildly wrong. The Pacific covers more of the Earth than all the land put together.
• Writing. If a character crosses an ocean, it should be a particular one, with a particular temperature.

Questions people ask

How many oceans are there?

Five, by the count most widely used today. Four, if you follow the atlases printed before about 2021. One, if you ask an oceanographer about the water rather than the labels.

Which is the newest ocean?

The Southern Ocean, recognised by the National Geographic Society on World Oceans Day in June 2021. It had been on maps before, removed in 1953, and argued over ever since.

Where does the Southern Ocean stop?

At 60 degrees south, a line in open water with no land anywhere near it. That line approximates the Antarctic Circumpolar Current, which is the real boundary and moves.

Which is the largest ocean?

The Pacific, by a very wide margin. It covers more of the Earth's surface than all the land put together.

Is the Arctic really an ocean?

Yes, and it is the smallest and shallowest of the five. It is also the only one that is substantially covered by ice, and the amount of that ice is changing quickly.

References

1. There's a new ocean now, National Geographic
2. Limits of Oceans and Seas, UNGEGN paper
3. Antarctic Circumpolar Current