The Genkai Sea (玄界灘, Genkai-nada)  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.
- ^ Loyd Batten, Bruce. Gateway to Japan:Hakata in War And Peace, 500-1300. University of Hawaii Press. p. 38.
33°40′N 130°00′E / 33.667°N 130.000°E