There is an Agastya-āśrama (Agastya-ashrama) on Devasaha Parvata (Devasaha Hills) near Gokarṇa (Gokarna) in the region of Pāṇḍya (Pandya). This āśrama was founded by one of Agastya’s disciples, as Mahābhārata (Mahabharata) refers to this āśrama as belonging to a disciple of Agastya – āśramo’gastyaśiṣyasya puṇye devasahe girau. But Agastya himself must have set his foot in this āśrama,  that is why it has come to bear Agastya’s name. According to the Mahābhārata (Mahabharata), this āśrama was located near the river Tāmraparṇī (Tamraparni). Tāmraparṇī has its source in a peak in the Western Ghats. This mountain peak, after Agastya’s name, is known as Agastyakūṭa (Agastyakut; ‘Agastya peak’). [See. Agastyakūṭa]

This peak is located in Tirunelveli or Tinneveli district of modern day Tamilnadu. The Pāṇḍya region is also identified with Tamilnadu in modern India. Therefore, in all probability this Agastya-āśrama was situated close to Agastyakūṭa. [See. Tāmraparṇī]

• In Kiṣkindhyākāṇḍa (Kishkindhyakanda) of Rāmāyaṇa (Ramayana), Sugrīva, while sending his monkey scouts southwards to look for Sītā (Sita), described the course that they should take. He mentioned that they would meet the powerful sage Agastya on Malaya Parvata (the Malaya Mountains). It is natural to assume that Agastya had an abode there.
  Rāmāyaṇa (Tarkaratna-Beng.)(4.41.15)
                         
• Balarāma (Balaram) once met Agastya in his āśrama on Malaya Parvata.
  Bhāgavatpurāṇa Vols. 1-12(10.79.16)
• Agastya was responsible for carrying out the process of Aryanisation on the landmass stretching from the southern foothills of the Vindhya Hills to the Bay of Bengal. Vāyu Purāṇa (Vayu Puran) determines the location of Agastya’s abode on Malaya Parvata in South India (which is popularly known as Mahāmalaya (Mahamalay) till date) – agastyabhavanaṁ tatra devāsuranamaskṛtam. 
  Vāyupurāṇa(48.23)
  Bhāgavata Purāṇa,Books 1-12(6.3.35)

• It may be mentioned in this context that Malaya Parvata is identified to be basically the southernmost fringe of the Western Ghats, which is spread out farther south of the river Kaveri. In that case we can ascertain that the Agastyāśrama in the Pāṇḍya region visited by the Pāṇḍavas (Pandav) during their pilgrimage is the same as the Agastyāśrama situated on the Malaya Parvata, and that this mountain is the source of the river Tāmraparṇī.