There are four broad masses Strangereal where most of the Ace Combat games are fixed and are separated by several major oceans and large seas, called Osea, Anea, Verusea and USEA. Air Combat (after retconning), Ace Combat 2 Ace Combat 3: Electrosphere and Ace Combat 04: Shattered Skies are all set USEA. Ace Combat 6: Fires of Liberation takes place in Anea, just north of Verusea. Ace Combat 5: The Unsung War reveals the Strangereal map for the first time, with its principal combatants, Osean Federation and the Union of Republics Yuktobanian, facing each other across the Ceres Ocean. The Atlantic Ocean is the largest ocean, affecting Osea, USEA and Verusa. The Cascade Ocean is the second largest ocean, affecting Osea, Anea and Verusa. The Arctic Ocean covers the North Pole, and the Pacific Ocean is below the Ceres Ocean.
A major historical event that takes place in the fall of Strangereal is big “Ulysses 1994XF04” asteroid. Its discovery in 1994 led to the creation of various superweapons to eliminate the threat of mass extinction of humans. One weapon, “Stonehenge” was completed and operational in time to destroy the asteroid from its arrival in 1999, but the fragments of the asteroid spread across the planet for pure damage and loss of life. The asteroid is a main catalyst for the events of Ace Combat 04: Shattered Skies and Ace Combat 6: Fires of Liberation.