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«Collinia» (コリニア,Korinia?) is the main settlement of the 75th Floor of Aincrad in Sword Art Online. The city is based on Ancient Rome. The city has many fighters and merchants living in it and is always bustling with activity, partly due to the many players that came to sight-see the newly-opened floor. This city is the last main city unlocked, as the destruction of Aincrad occured before the main city of the 76th Floor could be reached.
The city is mostly constructed from square bricks of white limestone. Its most notable building amongst its temple-like buildings and wide waterways is the huge colosseum which towers in front of the gate plaza.
Collinia was the site of the much-anticipated first duel between Kirito and Heathcliff. At least a thousand spectators came to watch the duel between the only two known users of Unique Skills. The duel was sponsored by the Knights of the Blood, which charged admission to the event.
When the game was cleared, Kirito and Asuna watched «Collinia» crumble into the clouds along with the other floors.