Songia (宋華, Songian Song-xia, Yamato Sonka) was a civilization lasting from the third millennium BC to the late seventh century AD. The civilization was centered in the Ku'an Valley, located in Taihei Tengoku. One of the original cradles of civilization, at its zenith Songia was the political, cultural, and economic center of eastern Crataea. The Song introduced metallurgy and a writing system to the east Crataean subcontinent. Songian civilization influenced all or part of Hakara, Hanseom, Questers, Taihei Tengoku, and Tairendia.
Songia fought Yamatai for over eight hundred years. Starting in the sixth century, Yamatai gained a durable advantage and disrupted the Songian tributary system. Songia's vulnerable borders were penetrated by nomads and raiders and many of its cities were sacked. Yamatai conquered the weakened Songia piecemeal, with the last Songian city falling in 686 AD. Although treated as equal subjects to the Yamato, colonization and intermarriage dissolved the once-distinct culture of the Song. By the eleventh century the Song people had ceased to exist, fully absorbed into the more populous Yamato.