I think my favourite version of Gorilla City isn't even from the mainstream continuity; it's the "Young Justice " Animated Series. In the comic-book tie-in, Gorilla City is a series of quonset huts created by the Brain and Ultra-Humanite. It's there where Monsieur Mallah is created, Ultra-Humanite got his new body; and we got to see not only Grodd and Solovar, but their mates Primat and Boka, their children/kin Simeon, Nnamdi, and Ulgo; and other denizens like Malavar, Kamau, Nzame, and Tolifhar (this version becoming the Ultra-Humanite's new body). Even other DC Gorilla characters got incorportated into it like Djuba (Bwanna Beast's ally) and Toto (original name for Superman rogue "Titano")
Young Justice.jpg
-Gorilla City exists in another dimension and one of it's portals just happen to be in Africa this time.
-Gorilla City is a floating autonomous city and they are always moving from one spot to another.
Take your pick.
"We all know the truth: more connects us than separates us. But in times of crisis the wise build bridges, while the foolish build barriers. We must find a way to look after one another, as if we were one single tribe."
~ Black Panther.