Northern Trade was the trade between China (Northern Song Dynasty) and the Oshu-Fujiwara clan or the Abe clan (Oshu) and the Dewa Kiyohara clan who dominated Ou before then.
北方貿易（ほっぽうぼうえき）とは、奥州藤原氏、あるいはそれ以前に奥羽を支配した安倍氏(奥州)や出羽清原氏が中国（北宋）との間で行った貿易。