Central Serican Plain

The Central Serican Plain (historically the Khalkhan Plain) is a large located in central Serica. It extends north of the larger South Serican Plain, bound in the northwest by the West Serica Sea, in the north by the approximate region encompassed by the Cherbol Forest, and in the east by the foothills of the Transerican Mountains. Both the Silver River and Alkiojoki River empty into the West Serica Sea northwards through the plain, historically providing irrigation to grasslands which hosted the native Khalkhan people.

In terms of modern state boundaries, the core of the Central Serican Plain is mostly covered by Phoenicia, whereas its northernmost edges and parts of its east are covered by Arsytia.

Etymology
Historically, the Central Serican Plain was known to neighboring polities as the Khalkhan Plain (Arsytian: VALTAAAAAAAAA; Phoenician: 喀爾戈平原, : Kāěrgē Píngyuán), derived from the eponymous Khalkhan people which traditionally made the plain their home. The region would retain this name even as it fell under the suzerainty of the Empire of Phoenicia in the 1000s and later the Arsytian Empire alongside the successive Arsytian Commune and finally the Arsytian Federative Socialist Workers' Republic. It is only after the Great Serrataran War (1936-1947) that consensus began to change, as the Phoenician invasion of Arsytia at the time and resulting territorial changes would result in Phoenicia obtaining much of the region, whereupon it designated the plain as the Central Serican Plain (Arsytian: VALTAAAAAAAAA; Phoenician: 中西洽平原, : Zhōng Xīqià Píngyuán) to erase the notion of regional Khalkhan heritage as part of its Phoenicization efforts.

Environment
Historically, the Central Serican Plain was a lightly forested, irrigated by the Silver and Alkiojoki rivers which pass through it. Agriculture in the region was historically sparse, owing to poor soil fertility due to forestation and a general lack of, resultant of its habitation by the traditionally nomadic Khalkhan people. This would change as the plain was conquered by the Arsytian Empire, which would develop the plain into a major agricultural region. The plain enjoys regular precipitation, creating a suitable environment for the flourishing of grassy vegetation and herbs, and later agricultural crops.

Nowadays however, the natural environment of the plain has degraded significantly, primarily as a result of the outbreak of the Great Serrataran War. Phoenicia's widespread deployment of in the region has inflicted  in over 90% of the plain, causing widespread  and consequent, as most plant species native to the region have been rendered critically endangered. This status quo has persisted even decades after the disastrous conflict, as the unrestricted pollution of the two irrigating rivers by upstream Phoenicia has rendered much of the regional groundwater unsafe for fauna and flora - arsenic continues to taint regional water supplies to this day. The continued presence of from the war has largely prevented any substantial redevelopment efforts.

Major cities
This is a list of cities in the Central Serican Plain with more than 100,000 in population.
 * Beicheng (historically Kharkhaan) Phoenicia (109,331)