The Kaveri River is crucial for Tamil Nadu's agriculture, irrigating approximately 55% of the state's cultivable land.

Appar (also called Tirunavukkarasu) composed the Thevaram hymns, the oldest Tamil devotional poetry dedicated to Lord Shiva.

Valanadu was the smallest administrative unit in the Chola empire's hierarchical administrative system.

According to Tamil literary tradition, the First Sangam is considered the earliest, though its historical accuracy is debated by scholars.

Vellore was a significant administrative and military center of the Vijayanagara Empire in Tamil Nadu, as evidenced by the Vellore Fort.

The Battle of Talikota weakened Vijayanagara Empire's control, allowing Pandya, Nayak, and other regional powers to consolidate independent kingdoms in Tamil Nadu.

Arikamedu, near Pondicherry, contains archaeological evidence of trade with the Roman Empire, including Roman pottery and beads dating to the 1st century CE.

Chola administration featured Sabha (assembly councils of Brahmins) and Ur (merchant associations), which represented sophisticated local governance structures documented in temple inscriptions.

Tamizhagam, promoted by the Dravidian movement, represents a vision of social order emphasizing Tamil linguistic and cultural pride while challenging traditional caste hierarchies and Sanskrit-centric frameworks.

The Chola administration featured sophisticated local governance through assemblies like 'Ur' (village councils) and 'Sabha' (merchant guilds), which were recorded in stone inscriptions.