This is one of the six lokas or worlds above the bhūloka or the earth. It is the sixth, calculated from bhūloka as the first.
According to the Viṣṇupurāṇa (2.7), the pitṛs (manes) called Vairājas live here.
The Bhāgavata (2.5.39) declares that devotees of Kṛṣṇa who please him by great austerities attain this world.
The Vyāsabhāṣya on the Yogasūtras (3.26) of Patañjali (200 B. C.) describes it as the abode of certain divine beings—Ābhāsvaras, Mahābhāsvaras and Sattva-mahābhāsvaras—who have a very long life, who are ever immersed in meditation and whose knowledge is immense.