Aadi Perukku, also known as Pathinettam Perukku, is a significant cultural event in Tamil Nadu that pays tribute to water bodies, particularly the Cauvery River, which sustains the state's agriculture. The festival holds deep agricultural and spiritual significance, marking the monsoon-fed replenishment of rivers and symbolizing prosperity and fresh beginnings. It is distinct among Tamil festivals as it is observed strictly based on the calendar date rather than the lunar star or weekday. The event remains a vital aspect of the cultural heritage of the Tamil-speaking population, reflecting a tradition of gratitude toward nature.