Śrāddha-kalpa: Amarakantaka–Tīrtha-Māhātmya and Akṣaya Pitṛ-Tarpaṇa
प्रत्यदेशो ह्यशिष्टानां शिष्टानां च विशेषतः / तत्र देवह्रदः पुण्यो ब्रह्मणो नागराट् शुचिः
pratyadeśo hyaśiṣṭānāṃ śiṣṭānāṃ ca viśeṣataḥ / tatra devahradaḥ puṇyo brahmaṇo nāgarāṭ śuciḥ
That region is a land of chastening for the uncultured, and all the more a place of special blessing for the righteous; there are Brahmā’s holy Devahrada and the pure Nāgarāṭ.