Chota Nagpur Plateau has the remains of an old fort belonging to the Nagavanshis. The Chhota Nagpur Plateau is a continental plateau—an extensive area of land thrust above the general land. The plateau has been formed by continental uplift from forces acting deep inside the earth. The Gondwana substrates attest to the plateau's ancient origin. It is part of the Deccan Plate, which broke free from the southern continent during the Cretaceous to embark on a 50-million-year journey that was violently interrupted by the northern Eurasian continent. The northeastern part of the Deccan Plateau, where this ecoregion sits, was the first area of
Shimōsa Plateau Prefectural Natural Park was established to protect Lakes Teganuma and Inbanuma, and is located at the north of the plateau. The Shimōsa Plateau has supported a population since ancient times, as evidenced by the large concentration of Jōmon period "kaizuka" or shell middens across the plateau. The plateau was historically located in Shimōsa Province, after which it was named, and was a productive agricultural area prior to the industrialization of Japan. The area served to produce rice and vegetables as early as the Nara period. Ranches on the Shimōsa Plateau flatlands were developed to raise horses. Additionally, the network of