Historical landmark • 1 Chome Wakaba, Shinjuku City, Tokyo 160-0011, Japan
Sakaimachi-saka slope in Yotsuya hints at the historical remnants concealed in the place name. This lush slope was once part of the inlet of Edo Bay, and was named after the occasional upstream migration of sharks.
Sakaimachi-saka slope, currently passing between the State Guest House and the Gakushuin Elementary School, is a gentle slope. This area was near the mouth of the Sakaimachi river, which poured into the pond during the Edo period, forming a slum called