Kamakura is a city located in Kanagawa Prefecture, Japan, about 50 kilometres (31 mi) south-south-west of Tokyo. Although Kamakura proper is today rather small, it is sometimes considered a former de facto capital of Japan as the seat of the Shogunate and of the Regency during the Kamakura-era (1185-1333). According to The Institute for Research on World-Systems, Kamakura was the 4th largest city in the world in 1250 AD, with 200,000 people, and Japan's largest, eclipsing Kyoto by 1200 AD. As of January 1, 2008, the city has an estimated population of 173,588 and a density of 4,380 inhabitants per square kilometre (11,300 /sq mi). The total area is 39.60 square kilometres (15.29 sq mi).