Mount Aris is a mountain peak located out just above the kingdom of Seaquestria, debuting in the episode "The Reef".
History[]
According to the legends told by Skystar, Mount Aris was part of two notable attacks. The first one involved both it and Seaquestria, which the mountain itself was attacked by the Ziz while Seaquestria was attacked by Leviathan. It was saved from destruction though thanks to the arriving "angels", who drove off both threats from the mountain.
A secondary attack however came from Grogar and his forces, which forced the local Hippogriff population to abandon Mount Aris to him, the population transforming into Seaponies to live in Seaquestria.
My Little Universe II[]
After hearing the story of Mount Aris's downfall, and how Novo refused to get it back thanks to Grogar's presence there, Lapis Lazuli, Connie Maheswaran, Steven Universe, and Pearl got Skystar and Silverstream to take them there with intent to revive Mount Aris to its former glory. At this point, the mountain's village was a ghost town, nothing ever visiting there since its abandonment including Grogar himself.