|Locations of interest|
|First appearance||Myst (game)|
The Osmoian Age was an Age mentioned in Atrus Channelwood journal. Nothing is known about this Age except its name. It is believed that this was simply a joke by Cyan, in reference to its second ever game, Cosmic Osmo. Some fans believe that Osmoian is in actuality the world the game Cosmic Osmo takes place in.