Nakaprishttha (IAST: Nakaprishttha — [world] of the god of the summit of the sky). However, regardless of the form, all of them mean the paradise of the god Indra.”
Bhagavad Gita
In the narration of the Bhagavad Gita (chapter 9, verses 20 and 21) Svarga is the middle heavenly world. It is inhabited by devas and deceased people who led a virtuous life: prayed to the gods and made ritual offerings to them — yajnas. For them Svarga plays the role of paradise. But when their virtuous karma, accumulated by a godly life in accordance with dharma, comes to an end, they will be forced to leave Svarga and reincarnate back into the world of Bhur-loka (on earth). According to the teaching of the Bhagavad Gita, attaining Svarga is a transitional stage in attaining liberation and entering the higher worlds.
Yoga Sutras
Patanjali in the Yoga Sutras (ch. 6) describes that the world of Mahendra (the Great Indra) is inhabited by six classes of heavenly beings (devas).
Vishnu Purana
In the Vishnu Purana (book 2) Svar-loka as a heavenly world is placed between the sun and the polar star Dhruva. Just as in the world of Bhur-loka (on earth) the inhabitants of this world are not free from desires, passions, and responsibility for the consequences of their actions — the actions of karma.
Kriya Yoga
Sri Yukteswar Giri, a follower of the philosophy of Kriya Yoga, in the book “The Holy Science” calls Svar-loka — Mahasunja, that is, the great vacuum.
In Esotericism
Helena Blavatsky in the book “The Secret Doctrine” (volume II) placed Svar-loka on the summit of the sacred Mount Meru.