Aqua Rock is a giant mountain located southwest of the town on Apojii Islands, on the island named Aqua Island, and it can be reached by sailing. It does not have much historical context revealed about it in The Lost Age. It can be assumed that it, like Air's Rock, it has stood on Weyard since the world's beginning. It is full of water-spouting guardian statues named moai that block entrance to the mountain and test the visitor's adeptness to manipulating Mercury Psynergy, and at the mountain's core is a room containing a tablet laced with a Psynergy power usable only by a wielder of water's might, the Parch Psynergy which can be used to make pools of water effectively disappear and evaporate. It is merely speculation that Aqua Island's mechanisms were constructed in Weyard's ancient past