Agastyakoodam / Agasthyarkoodam is a 1,868-metre (6,129 ft) tall peak of the Pothigai mountain range of Tamil Nadu and within Neyyar Wildlife Sanctuary, Kerala in the Western Ghats of South India. The peak is part of the Agasthyamala Biosphere Reserve which lies on the border between Kerala and Tamil Nadu . The perennial Thamirabarani River originates from the eastern side of the range and flows into the Tirunelveli district of Tamil Nadu.