Tondai Nadu

Tondai Nadu (Tamil: தொண்டைநாடு) is a historical region located in the northernmost part of Tamil Nadu. The region comprises the districts which formed a part of the traditional Pallava kingdom. The boundaries of Tondai Nadu are ambiguous – while some included only the Chennai, Tiruvallur, Kanchipuram, Tiruvannamalai and the northern part of Viluppuram district in Tondai Nadu and grouped the southern part of Viluppuram District, the Union Territory of Pondicherry and Cuddalore District under a separate region called "Nadu Naadu", some even included the Vellore District and the so-called "Nadu Naadu" in Tondai Nadu. The Tondai Nadu region also included the Chittoor and Nellore districts of Andhra Pradesh.

Read more about Tondai Nadu:  History