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.
Yokohama Yokohama (Japanese: 横浜市 , Hepburn: Yokohama-shi ) is the second largest city in Japan by population, after Tokyo, and the most populous municipality of Japan. It is the capital city of Kanagawa Prefecture. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu. It is a major commercial hub of the Greater Tokyo Area.