Chola Nadu is a region of Tamil Nadu state in southern India. It encompasses the lower reaches of the Kaveri River and its delta, and formed the cultural homeland and political base of the Chola Dynasty which ruled most of South India and parts of Sri Lanka and South-East Asia between the 9th and 13th centuries AD. Uraiyur (now part of Tiruchirapalli city) served as the early Chola capital, then medieval Cholas shifted to Thanjavur and later cholas king Rajendra Chola I moved the capital to Gangaikonda Cholapuram in the 11th century.