關東平原
Kawaguchi is located near the center of the Kantō Plain in southern Saitama Prefecture, and is bordered by the Tokyo wards of Kita-ku and Adachi-ku to the south. The city area is mostly flat and mainly residential except for the Omiya tableland, which occupies part of the north and east area. The Arakawa River runs across the border with Kita-ku to the south.