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The city of Kamakura, Kanagawa in Japan, is closed off on three sides by very steep hills and on the fourth by the sea: before the construction of several modern tunnels and roads, the so-called Seven Entrances (Nana-guchi), or Seven Passes (七切り通し, Nana-kiridoshi) (all artificial) were its main links to the rest of the world. The city was therefore a natural fortress and, according to the Azuma Kagami, it was chosen by Minamoto no Yoritomo as his base specifically for this reason. The name itself seems to have been modeled on that of Kyoto's Seven Entrances (京都七口)—sometimes translated as the seven "mouths"—which first appears in the literature of the intermediate Muromachi period (around the year 1450).