"Whitefall isn't civilization in the strictest sense."
4th Athenian moon, a large percentage of which is owned by a woman named Patience. The crew visits Whitefall during pilot episode Serenity.
Whitefall is also featured in the movie Serenity, on one of the screens on the bridge when Serenity is at Haven, after it has been attacked. It shows a dead guy and the word "Whitefall" in the bottom right, just before the Operative appears on the screens.