>>536212080
https://www.wowhead.com/guide/bfa-missions-and-followers
If you count Lordaeron which was altered for the opening cinematic and BfA quest at the beginning, there are basically three.
People also talked about Quel'thalas Warfronts back in the day.
https://us.forums.blizzard.com/en/wow/t/quelthalas-warfront/101811