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The ruins of a castle from Korea's ancient Balhae Kingdom (698-926) have been discovered in Primorsky Krai ― known as Yeonhaeju here in the past ― 360 kilometers from Vladivostok, Russia.

The Natural Cultural Properties Research Institute announced Thursday that after observing the site with their Russian counterparts, the Koksharovka-1 area included castle remains from Balhae and also numerous relics.