Thiruvaiyaru is a panchayat town in Thanjavur District in the Indian state of Tamil Nadu. Thiruvaiyaru means Five Rivers around the city. The Fiv…Thiruvaiyaru is a panchayat town in Thanjavur District in the Indian state of Tamil Nadu. Thiruvaiyaru means Five Rivers around the city. The Five Rivers are Vadavaar, Vennaar, Vettaar, Kudamurutti and Kaveri.