World Oceans Day — why is it plural?

Today is the World Oceans Day. Why is ‘World Ocean’ in it plural? There is only one World Ocean. Or did they just omit the apostrophe before the -s?


There are five oceans:

  • Atlantic Ocean
  • Pacific Ocean
  • Indian Ocean
  • Arctic Ocean
  • Southern (Antarctic) Ocean

and they are all considered on World Oceans Day.

This isn't the same construct as "World Bicycle Day" because that doesn't consider all the separate bicycles in the world, but rather the concept of cycling.