九十九里浜
is an inlet on the northeast coast of Chiba Prefecture that ranges from Cape Inubō in Chōshi to Cape Gyōbumi in Asahi. Byōbugaura is an important part of the coastal area in Chiba Prefecture, as it connects the northern point of the Pacific Ocean coast at Chōshi to Kujūkuri Beach, which covers a large portion of the western side of the prefecture. The name of the inlet is formed from the word "byōbu", the Japanese-style folding screen, and "ura", meaning an inlet. Byōbugaura resembles the White Cliffs of Dover on the English Channel. For this reason the inlet is sometimes called , or "Dover of the East". Byōbugaura is known for its long history of marine erosion.