The Pothigai Hills, also known as Agasthiyar Mountain is a 1,866-metre (6,122 ft)-tall peak in the southern part of the Western Ghats of South India. The peak lies in Tirunelveli District of Tamil Nadu near the border of Kerala. The area contains several important natural habitats for in-situ conservation of biological diversity, including forests containing threatened species of significant value to science and conservation.