Kujūkuri Beach (九十九里浜 Kujūkuri-hama) is a sandy beach located on the east coast of the Bōsō Peninsula in Chiba Prefecture, Japan. Lying within 60 km of Tokyo and being the second longest beach in Japan, it is a popular swimming and surfing destination for inhabitants of Greater Tokyo.
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The coastal region of the beach is the north-eastern end of Kuroshio Current influence in Japan.
"Kujūkurihama" literally means "ninety nine ri (sandy) beach." Minamoto no Yoritomo was thought to order the measurement of the beach, and 99 arrows were stuck on the sand—one every ri. The unit "ri" was then 6 chō (approx. 660 m), but later the ri extended somehow to 36 chō (ca. 3.9 km). The short ri of 6 chō has long been forgotten or not in use, thus today many believe and explain incorrectly that 99 is just an inference of its long distance.
The actual length of the beach is approximately 66 km, making the original measurement by Minamoto no Yoritomo the correct one.
The last days of the World War II, Operation Coronet was planned, to land on the beach for Tokyo.
A northern species chum salmon returns to a river of the beach every year, the southernmost in Japan.
According to a programme of NHK, Kujūkuri is the best place in Japan to observe the sanderling. These tiny birds can be seen on most spring and autumn days following the ebb and flow of the waves at amazing speeds in search of food.