The Genkai Sea (玄界灘, Genkai-nada)[1] is a
body of water that comprises the southwestern tip of the
Sea of Japan and borders the northern coasts of
Fukuoka and
Saga prefectures.
References
^Loyd Batten, Bruce. Gateway to Japan:Hakata in War And Peace, 500-1300. University of Hawaii Press. p. 38.