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
Xiangkhoang Plateau the Xiangkhoang. Altitudes within the plateau area may reach 1000 m. Several tributaries of the Mekong drain in the plateau, such as the Nam Ngum, Ngiap and the Khan River. The major town in the area is the capital of Phonsavan. The plateau gives its name to present-day Xiangkhouang Province in which Phonsavan is located. The plateau is the location of the Plain of Jars, which is a collective name for several sites with funerary archeological remains nominated for UNESCO World Heritage status. The plateau is also one of the most heavily contaminated areas in the world from unexploded cluster