(That's actually the name of a neighborhood near me ... the name of the elementary school I went to (in that neighborhood))
I just got it on a recent update. Here's what the game says:
"NORTHRIDGE - Enjoy the new permanent location in the Eternal Ice: Northridge! - Arrange a rescue operation and a chase with a shoot-out. - Find a way to cross the ice ridge!"
I'm probably not a high-enough level to find out much more about Northridge (in the game); but I go ahead and look in my "TRAVELLER'S DIARY," and see a few locations I don't think they mention 'in this FANDOM' yet - [Darfoot], [Horton], [Yuton], [Forest Rock], [Windsor], [Greenlee], [Storm Canyon], [Beorn], [Storm Canyon], [Lormuth], [Rocksmore Ravine] ... and a lot more (so I understand if the member(s) who listed some locations in the [Expedition locations] didn't 'catch them all').