Agastya Mala is one of the peaks in the Western Ghats of Thiruvananthapuram District of Kerala, near to the border of Tamilnadu, India. This peak is a part of the Agasthyamala Biosphere Reserve which lies on the border between the Indian states of Tamil Nadu, Tirunelveli district and Kerala, Thiruvananthapuram district. The perennial Thamirabarani River originates from the eastern side of the range and flows into the Tirunelveli district of Tamil Nadu. It is 1,868-metres tall.