Osean Federation
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Osea, officially the Osean Federation, is a massive Strangereal country and international superpower located on the Osean continent. Osea encompasses a majority of the continent's western landmass and shares land borders with Belka, Ustio, and Sapin to the east and Perbla to the south. Its capital, Oured, is located on the tip of Osea's southeastern peninsula near Oured Bay.
Osea is a highly developed country that possesses a large population, an extensive infrastructure, a thriving capitalist economy, and a well-outfitted military force, the Osean Defense Forces. Osea is also considered one of the world's foremost leaders in aeronautics and space-exploration development. The country's achievements include the construction of the Strategic Orbital Linear Gun, the Arkbird (a joint program with Yuktobania), and the International Space Elevator.

By virtue of its world power, Osea held expansionist ideologies and annexed new territories throughout the 20th century. The country's aggressive nature directly resulted in major conflicts such as the Osean War, the Belkan War, and the Usean coup d'état. A rivalry also existed between Osea and Yuktobania, which led to the Cold War in the 1980s and 1990s.

In the 21st century, especially following the election of President Vincent Harling, Osea's expansionism was curtailed and the country diminished its military power to follow a more peaceful foreign policy. Despite the Circum-Pacific War against Yuktobania, which was orchestrated by Belkan extremists as revenge for the Belkan War, this policy of peace continued into the 2010s. However, due to previous tensions and miscommunication regarding the development of the International Space Elevator, the Kingdom of Erusea declared war on Osea in 2019, leading to the Lighthouse War.