These are maps of Northeast Asia during the Samguk Period.
The Samguk Period was a time of intense competition in the Korean Peninsula with three powerful states - Goguryeo, Baekje, and Shilla - striving to gain control of the region while dealing with the threat of the restless Chinese empire and the rising Japanese state. Contemporaneous to this contest of power between three Korean kingdoms are the waxing and waning of Chinese dynasties (notably the Han, Sui, and Tang) and the development of Japan under the rule of the Yamato clan.
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