Shimoda (, Shimoda-shi) is a city and port in Shizuoka, Japan. As of 2010, the city had an estimated population of 25,054 and a population density of 242 persons per square kilometer. The total area was 104.70 square kilometres. In the 1850s, Japan was in political crisis over its increasing inability to maintain its national seclusion policy and the issue of what relations, if any, it should have with foreign powers. For a few years, Shimoda was central to this debate. Shimoda is located at the southern tip of the Izu Peninsula about 60 miles (97 km) southwest of Tokyo. Shimoda location, with the Amagi Mountains to the north, and the warm Kuroshio Current to the south give the city a humid, sub-tropical climate.