Heya! Thankfully Greyah already posted the Horde guild directory, but for this bit in particular, my guild is currently on their first big campaign…which takes place in Pandaria! We’re usually situated in Kalimdor but an old friend reached out for help, so we’re seeing what the hip-hap is there these days!
Also, the Southfury Watch are some incredible roleplayers and all-around great folks, I highly recommend checking them out. They’re much more established than my own guild, but more importantly, I can say from experience that they’re a blast to RP with!
Wherever you go, best of luck in your search! Oh…the Alliance guild directory is below, but very outdated as I never get updates/listings for Alliance guilds. =(