How many oceans are there on Earth? National Geographic now says five.

For the first time in the more than 100 years that the National Geographic Society has mapped the world’s oceans, it will recognize five of them. The organization announced this week that it will recognize the Southern Ocean, a body of water that encircles Antarctica, as the world’s fifth.

“Scientists have long known there’s a distinct ecological region around Antarctica,” National Geographic Society geographer Alex Tait said in an interview. But at least in the international scientific community, there hasn’t been agreement on the name and boundary of this body of water.

Read more at the Washington Post.