Nakaumi (中海) is a brackish lake located between Tottori and Shimane prefectures in Japan. The lake is enclosed by the Shimane Peninsula to the north and Yumigahama Peninsula to the east. It is the fifth largest lake in surface area in Japan.
Nakaumi connects Lake Shinji (宍道湖 Shinji-ko) and the Sea of Japan, and is surrounded by the municipalities Matsue, Yasugi, Yonago and Sakaiminato.
Shimane Prefecture (島根県, Shimane-ken; Japanese pronunciation: [ɕiꜜ.ma.ne, ɕi.ma.neꜜ.keɴ]) is a prefecture of Japan located in the Chūgoku region of Honshu. Shimane Prefecture is the second-least populous prefecture of Japan at 665,205 (February 1, 2021) and has a geographic area of 6,708.26 km. Shimane Prefecture borders Yamaguchi Prefecture to the southwest, Hiroshima Prefecture to the south, and Tottori Prefecture to the east.
Matsue is the capital and largest city of Shimane Prefecture, with other major cities including Izumo, Hamada, and Masuda. Shimane Prefecture contains the majority of the Lake Shinji-Nakaumi metropolitan area centered on Matsue, and with a population of approximately 600,000 is Japan's third-largest metropolitan area on the Sea of Japan coast after Niigata and Greater Kanazawa. Shimane Prefecture is bounded by the Sea of Japan coastline on the north, where two-thirds of the population live, and the Chūgoku Mountains on the south. Shimane Prefecture governs the Oki Islands in the Sea of Japan which juridically includes the disputed Liancourt Rocks (竹島, Takeshima). Shimane Prefecture is home to Izumo-taisha, one of the oldest Shinto shrines in Japan, and the Tokugawa-era Matsue Castle.
View the full Wikipedia page for Shimane Prefecture