In verse 273 of Naṉṉūl, a 13th-century book on Tamil grammar, Sankara Namasivayar recites a venpa that describes the twelve districts of Tamil Nadu where Koduntamil is spoken, as Thenpandi Nadu, Kutta Nadu, Kuda Nadu, Karka Nadu, Venadu, Poozhi Nadu, Pandri Nadu, Aruva Nadu, Aruva Vadathalai, Seetha Nadu, Malai Nadu and Punal Nadu.
Thirukkuṛaḷ is a combined word formed by joining the two words Thiru (meaning revered) and Kural (is a form of poem writing style, like Ballad in English Poems. Other forms of poem writing styles in Tamil are Venpa, Yaappu etc.).