It is mentioned in Kiṣkindhyākāṇḍa (Kishkindhyakanda) of Rāmāyaṇa that the beautiful Mahendra Parvata (Mahendra Hills) are built by sage Agastya. 

Clearly the presence of another Agastya-āṣrama may be assumed at the site of Mahendra Parvata. Mahendra Parvata can be located in modern day Orissa. [See: Mahendra Parvata]