What is the largest plain in Japan? -

For my Japanese class I have to do a project on Japan s geography. I ve been looking all over different websites but none are telling me the info I need to know so could someone help me out?

Kanto Plain. Tokyo is in this plain. Other prefectures are Saitama, Chiba and part of kanagawa. Saitama dominates the plain. It is cold without snow in winter and very hot in summer. It is pretty much continental climate.