Shimōsa Plateau
Suigo-Tsukuba Quasi-National Park sits to the northeast of the Shimōsa Plateau in Chiba and Ibaraki prefectures. The park was established on March 3, 1953 and protects natural areas and cultural heritage of, among other areas, the Tone River basin directly to the north of the plateau. Imba-Teganuma Prefectural Natural Park was established to protect Lakes Teganuma and Inbanuma, and is located at the north of the plateau.