Collinia

«Collinia» is a city in Aincrad of the game Sword Art Online. It is located on the seventy-fifth floor, with the city based on Ancient Rome. It has many fighters and merchants living in the city and it was bustling with activity, partly due to the many players that came to sight-see the newly opened floor. This city is the last location unlocked, before the destruction of «Aincrad».

Sword Art Online
Geographically, 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 Unique Skill users. The duel was sponsored by the Knights of the Blood, which charged admission to the event.

When the game is cleared, Kirito and Asuna watch «Collinia» crumble into the clouds along with the other floors.