- "Fort Ouph means 'The Fort of Elves.' It originated as a fort built in preparation for a war with Carmina Gadelica, but since the peace agreement, it has acted as a watch tower for monsters."
- — CC Corp —
Aerial City Fort Ouph is a flying fortress that floats in the clouds high above the city of Dun Loireag. It consists of a series of floating platforms connected by several narrow walkways. The centermost platforms contain the Chaos Gate and Save Station, while the outer platforms hold the Grunty Ranch and various equipment shops. Several satellite platforms float outside of the main structure, giving the city additional defense.
The Fortress was originally built by the Elves in order to reach the realm of the Gods. But after their plan failed Fort Ouph was converted into a lookout area to make sure no monsters escaped through the Spirit Shield that protected the human cities. During the War Against the Gods, Fort Ouph was blasted out of the sky by the Gods and fell into Dun Loireag resulting in the mutual destruction of both cities. The city Dol Dona was built atop the ruins.
- Fort Ouph is the only Root Town that has two themes. One is heard in .hack//OUTBREAK and .hack//QUARANTINE. The other can only be heard by either BGM on Kite's desktop (OUTBREAK and QUARANTINE) or defeat Corbenik in QUARANTINE and return to the server.