The oldest moat settlement from the Yayoi period known until now is the one from Initial Yayoi period discovered at Etsuji site of Kasuya-machi, Fukuoka Prefecture, located nearby the coast of Genkainada in northern Kyushu.
今のところ、弥生時代でもっとも古い環濠集落は、北部九州の玄界灘沿岸部に位置する福岡県粕屋町の江辻遺跡で弥生時代早期のものが見つかっている。