黑潮
Kujūkuri Beach extends in the shape of an arc from Cape Gyōbumi in Asahi to the north to Cape Taitō in Isumi, Chiba Prefecture to the south. The beach is relatively straight, in contrast to the typically irregular coastlines of Japan. The coastal region of the beach is the north-eastern end of Kuroshio Current influence in Japan. The tides and the Kuroshio Current create sand deposits along the length of the beach which form sand dunes of to . Kujūkuri Beach has no reef.