諏訪湖
The lake is located on a plateau with an altitude of 654m, which is between Mount Madarao in the east and Mount Kurohime in the west. With an area of 4.56 km2, it is the second largest natural lake in Nagano Prefecture after Lake Suwa. It has a depth of 39.1 m (128.2 ft), and its storage volume exceeds that of Lake Suwa. The water of the lake flows out through the Ikejiri River, joins the Seki River, and flows into the Sea of Japan.