Study on the actual situation of Japanese ancient northern area which faces Tsugaru strait through trade and exchange

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We studied the actual situation of ancient North-Japan area which faces Tsugaru strait. At first we researched historical material on ancient north- south trade, then researched Zokujomon ware and Satsumon ware, besides, we completed the databeses about the historical materials and ware. We utileized the databases, then grasped the actual situation about exchange of ancient northern area. Throughout ancient times, there was common system on the trade in the ancient northern area. For example, between Mutsu-wan and Hokkaido, between the basin of the Iwaki river and Dewa district, between Kennan of Aomori and Mutsu district. This is the reason of formation of dominant characteristic in following times.