How many volumes were held by library serving the southernmost prefecture of Japan in 2016?
Naha Naha (那覇市 , Naha-shi , ]) is the capital city of Okinawa Prefecture, the southernmost prefecture of Japan.
Tsuken Island Tsuken Island (津堅島 , Tsuken-jima , Okinawan: "Biti") is an island in the Pacific Ocean in Uruma, Okinawa Prefecture, Japan. The island is southernmost of the Yokatsu Islands, and is located 3.8 km south south-east of the Katsuren Peninsula off Okinawa Island at the entrance of Nakagusuku Bay. Tsuken covers 1.88 km2 and has a population of 487 residents.