We will talk about the downfall of Balhae, a kingdom that was known as the "prosperous nation of the East Sea" and prospered greatly, and the fate of Balhae's surviving citizens, which frequently sent envoys to Japan. Channel membership is now available. / @c-history *The theory that "the downfall of Balhae was caused by the eruption of Mt. Paektu," which was popular in the 1990s, was refuted in the early 2000s when it was discovered that the eruption occurred after Balhae's downfall. You can read papers on the subject by searching for "Reexamination of the explosive eruption history of Mt. Paektu (Changbai Mountain)." 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