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Xiwangguo
Capital	Xi'an
Official languages	Xi, Mankut
Ethnic groups	Xi, Mankut
Demonym(s)	Xi
Government	Constitutional monarchy
• Khagan	Askar XVII
Establishment
• Coronation of Nimaha Yelu (Start of Nimaha Dynasty)	1178 BCE (semi-mythical)
• Coronation of Asuke Fiyanggu (Start of Asuke Dynasty	743 CE
• Coronation of Ikdemi Nikan (Start of Ikdemi Dynasty)	1238 CE
• Coronation of Askar I Khagan (Union with Oshkhanate)	1432 CE
Currency	Som (UK$)
Driving side	right

Xiwangguo (Xi: literally "Western Kingdom", pragmatically "Western Realm") is a historic state in the eastern part of the continent of Ochran in the region of Ajax. Xiwangguo began as a Sinitic-speaking civilization which fell under the rule of Mankut peoples in the 12th century before the common era, independent from the rest of Sinitic-speaking Taizhou until the 7th century BCE. The country was intermittently conquered before regaining its independence under a succession of increasingly-Sinicized Mankut dynasties before it united with the Oshkhanate in 1432 under the unified rule of Askar I Khagan.

As part of the unified realm of Uluujol after 1432, Xiwangguo has maintained a favored status and identity relative to the other subject peoples of the Khaganate, owing to its nature as a willing partner in the creation of the Khaganate rather than a conquered nation. This includes a greater degree of autonomy for the governors of the Xi provinces in Uluujol.

The current ruling Yu dynasty of Uluujol originally hails from this region of the Khaganate.

Xiwangguo contains the Khaganate's only sea access in its eastern regions, centered on the major port of Kunming.