Found this in my notes from a few years ago: 富士本９０度公園 is a park in Kokubunji that represents the center / balancing point of Tokyo-to (not counting islands). Referred to as Tokyo’s belly button (center of gravity) 東京のへそ 【重心】. North of Kunitachi Station.
35.7103098,139.4448336
by thetokyofiles