ken (prefecture), central Honshu, Japan, facing the Pacific Ocean. It is located in the northeastern Kanto Plain. Ibaraki is bordered (south) by the Tone River and contains part of Suigo-Tsukuba Quasi-national Park. Main features of this section of the park include Lake Kasumi (Kasumiga-ura), the second largest Japanese lake after Lake Biwa; the canals and creeks of the Tone River delta; the ancient Shinto Kashima Shrine; and the tourist centre of Itako town.
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