Flourite Plains was a very large area in Feralheart, often overpopulated by characters. It is no longer in the game as of the June 9th, 2016 update.
The areas in this map included a couple of dens sprinkled around, large mounds and a stone bridge. The stone bridge was a place that most people visited to advertise their roleplay groups, mapped or not. Pups/Cubs could glitch through the stone bridge, and to others it looked like they are standing on the bottom of it.
The chat was very fast because of the overpopulation, and a player's message wouldn't show up for long before it was replaced with someone else's. The most common roleplays here were Warrior Cats, which inhabited more than half of the map.