Mito is the capital and largest city of Ibaraki Prefecture, with other major cities including Hitachi, Hitachinaka, and Tsukuba. Ibaraki Prefecture is located on Japan's eastern Pacific coast to the northeast of Tokyo, and is part of the Greater Tokyo Area, the most populous metropolitan area in the world. Ibaraki Prefecture features Lake Kasumigaura, the second-largest lake in Japan, and Mount Tsukuba, one of the most famous mountains in Japan. Ibaraki Prefecture is home to Kairaku-en, one of the Three Great Gardens of Japan, and is an important center for the martial art of Aikido.