Ryogoku is a one-industry town inside the city, and the industry is sumo. Three kilometres by the river take in the arena, the stables, the hotpot the wrestlers eat, an old feudal garden, and a park that carries some of Tokyo's heaviest history.
Start at the Ryogoku Kokugikan, the national sumo hall — green-roofed, banner-hung, the champions' portraits out front. Most days there's no tournament, but the building sets the key. The streets around it are the stable district: heya where wrestlers live and train, nameplates by the doors, the thud of practice through an open shutter if you're early. Lunch is chanko-nabe (the sumo hotpot), often served by men who once fought in the ring — one pot feeds a wrestler, so come hungry.
North lies Yokoami-cho Park, and the mood turns: this is the memorial ground for the 1923 firestorm and the 1945 raids, and it asks to be walked quietly. Then the Kyu-Yasuda teien (garden), a feudal pond now free and empty, before the Sumida embankment carries you down to Morishita.


