1Kantō — the region of Japan centered on Tokyo, made up of Tokyo and the surrounding prefectures (Kanagawa, Chiba, Saitama, Ibaraki, Tochigi, Gunma).
彼女は関東出身だが、今は関西で働いている。
She's from the Kanto region, but now works in Kansai.
明日、関東地方は広い範囲で雨が降るでしょう。
Tomorrow it will likely rain across a wide area of the Kanto region.
関東と関西では、同じ料理でも味付けが違うことが多い。
Even the same dish is often seasoned differently between Kanto and Kansai.
2A historical term for the eastern part of Japan, used in periods such as the feudal era; its area could differ from the modern-day Kanto region.
鎌倉幕府は関東を拠点として勢力を広げた。
The Kamakura shogunate expanded its power with Kanto as its base.