Tondaimandalam, also known as Tondai Nadu, is a historical region located in the northernmost part of Tamil Nadu and southernmost part of Andhra Pradesh. The region comprises the districts which formed a part of the legendary kingdom of Athondai Chakravarti. The boundaries of Tondaimandalam are ambiguous – between the river basins of Penna River and Ponnaiyar River. During the reign of Rajaraja I, this region was called as Jayankonda Cholamandalam.

Tiruvallur district, also spelled as Thiruvallur district, is one of the 38 districts in the Indian state of Tamil Nadu. The fast developing city of Tiruvallur is the district headquarters. The district has a mixture of urban and rural characteristics. The eastern part of Tiruvallur district is dominated by urban characteristics while the Northern part of the district has influence of Andhra culture due to its position. In 2011, the district had a population of 3,728,104 with a sex-ratio of 987 females for every 1,000 males.