The capital of Bokkai, back then, was not in Shangjing Longquanfu yet (present Mudanjiang City, Heilongjiang Province, China); it was still at Dongmu Mountain (present Dunhua City, Yanbian Korean Autonomous prefecture in Jilin Province, in China).
当時の渤海の都はまだ上京龍泉府（現・中国黒竜江省牡丹江市）ではなく、東牟山（現・中国吉林省延辺朝鮮族自治州敦化市）にあった。