Board Thread:General Discussion/@comment-2600:8805:3B02:6150:B9FB:92A:BC68:B50-20180410030016/@comment-4010415-20180410030737

They said it at the end of Round One (Volume 3 Episode 1) when they announced Team JNPR vs Team BRNZ:

Port: (announcing over the cheering crowds) Team JNPR of Beacon versus Team BRNZ of Shade!

And then they said it again in New Challengers when announcing Team SSSN vs Team NDGO:

Port: (displaying a picture of the four new challengers to his right) Team NDGO of Shade is certainly a crowd favorite, but these lovely ladies are going against some of the toughest, testosterone-filled teammates we've seen so far!

Basically,


 * Vale = Beacon


 * Mistral = Haven


 * Atlas = Atlas


 * Vacuo = Shade