Hokkaido : Sapporo

Main city is Sapporo, this is the least populated part of Japan

Tohoku : Sandai

Known for it's winter sports, matsuri and excellent food

Kanto : Tokyo

Contains the sprawling urban area of Greater Tokyo.

Chubu : Kanazawa

Between Kyoto and Tokyo, contains Mount Fuji;

Kinki/Kansai : Kyoto & Osaka

Cities of Osaka, Kyoto and Kobe

Chugoku : Hiroshima

Main city is Hiroshima, with the Hiroshima Peace Memorial

Shikoku

Has the most active volcanoes and best know onsen resorts.

Kyushu : Fukuoka & Kagoshima

Nice for nature, temples and onsen

Okinawa

Okinawa has eight main islands each with a unique culture