The cultural region on Kyushu Island and the Neolithic culture of the Korean peninsula and the Gulf of Bo Hai coast had many common elements such as chipped stone saws and assembled fishing needles; therefore, it is assumed that there were constant exchanges between the peoples and goods among these regions.
九州島の文化圏は打製石鋸や結合型釣り針など、朝鮮半島や渤海湾沿岸の新石器文化との間に共通する要素を多く持っており、これらの地域との間で継続的に人や物の移動があったと推測されている。