Agastya Malai is also referred as Agastyakoodam and is situated in the Western Ghats of south India. It is located at a height of 1,868 metres (6129 feet) above mean sea level. Agastya Malai Mountain lies at the border between the states of Kerala in Kollam and Thiruvananathapuram districts and Tamil Nadu in Thirunelveli district. Agastya Malai Mountain is located at a distance of thirty-two kilometers from Neyyar dam. The nearest airport is the Trivandrum International Airport at a distance of sixty-one kilometers and the nearest railway station is the Ambasamudram in the district of Tirunelveli.

The Agastya Malai is the source of the perennial river Thamiarabarni, which flows in the Thirunelveli district of Tamil Nadu. This peak is a major pilgrimage center for devotees of the Hindu sage Agastya. Agastya is one of the seven rishis of Hindu Puranas. There is a statue of Agastya at the top of a peak where devotees can worship him and place their offerings. The lower elevation of the Agastya Malai is known for the availability of rare herbs and medicinal plants. Nearly two thousand medicinal plants used in Ayurvedic treatments are found here.