Agniṣvātta (Agnishvatta) is the term referring to a particular sect of the manes (pitṛ; pitri) as well as the space allocated to them. The region called Agniṣvātta, named after the pitṛ residing there, is located in the south of the cosmos, beneath the Earth and above the upper regions of the abyss called atala — antarāle eva trijagatyāstu diśi dakṣiṇasyām adhastād bhūmerupariṣṭācca jalād yasyām agniṣvāttādayo pitṛgaṇā diśi svānāṁ gotrāṇāṁ parameṇa samādhinā satyā evāśiṣa āśāsānā nivasanti.
Yama, the god of death and lord of the pitṛ, wielding his staff which is the ensign of his authority over all souls, also stays here along with his courtiers.
According to a different opinion, there are a number of spaces of the manes (pitṛloka; pitriloka) known as Somapatha. These places are inhabited by the sons of Mārīca (Maricha), who are fathers of the gods. These fathers of the gods, always immersed in performing religious rites, are renowned as Agniṣvātta.
Another observation is, there is a pitṛloka called Somapadā (Somapadaa) or Somapāda (Somapaada) near where the Vaivasvata souls reside. The pitṛ residing in this space are known as Agniṣvātta.
The souls of those householders who do not perform religious rites and yajña (yajna) come to be known as Ārtava (Artava). These pitṛ are also included among the Agniṣvātta manes — gṛhasthāścāpyayajvānaḥ agniṣvāttāstathārtavāh. Then again, it is elsewhere reported that the Agniṣvātta manes perform homa (ritual of yajña involving making offerings into the fire) with ghee or yājyā (yajya) homa — agniṣvāttaḥ smṛtāsteṣāṁ homino yājyayājinaḥ.
The pitṛ residing in the pitṛloka called Viraja also form a part of the Agniṣvātta manes. Five sons were born to Pivarī (Pivari), the daughter born out of the heart of the Agniṣvātta pitṛ, by Vyāsa’s (Vyasa) son Śukadeva (Shukadeva). Their names were Kṛṣṇa (Krishna), Gaura, Prabhu, Śambhu and Bhūriśruta [Bhurishruta (or Bhūriśravā; Bhurishrava)]. Kīrtimatī (Kirtimati) was the daughter born of the same union – she later gave birth to the famous king Brahmadatta — utpadyante ca pīvaryāṃ ṣaḍime śukasūnavaḥ/ bhūriśravā prabhuḥ sambhuḥ kṛṣṇo gauraśca pañcamaḥ/ kanyā kīrtimatī caiva yogamātā dṛḍhavratā.