Japan Nipon- West coast Ando Zaki to Otose Zaki including Sado island, from the latest Japanese government charts. 1. Tsukumo Wan 1:12,140, from a Japanese government survey 1887. 2. Sakata HR 1:18,490 from a Japanese government survey 1898. 3. Sado I. Yebisu Ko 1:37,840 from a Japanese government survey 1888. 4. Ogi Ko 1:24,690 from a Japanese government survey 1888. 5. Naoyetsu Ko 1:40,570 from a Japanese government survey 1892. 6. Niigata Ko 1:40,570 from a Japanese government survey 1904.