Loka

'Planet') is a concept in Hinduism and other Indian religions, that may be translated as a planet, the universe, a plane, or a realm of existence.

[1] A primary concept in several Indian religions is the idea that different lokas are home to various divine beings, and one takes birth in such realms based on their karma.

Of special significance is the Indian subcontinent, referred to as Bharatavarsha, which is a land where the fruits of one's actions allows one passage into either Svarga or Naraka.

[7] In Vedic mythology, Svarga is filled with the nectar of immortality, amrita, with lakes containing lotuses, pools of wine, milk, and ghee, as well as streams that are replete with honey.

[10] The Bhagavata Purana enumerates the following 28 Narakas: Tamisra, Andhatamisra, Raurava, Maharaurava, Kumbhipaka, Kalasutra, Asipatravana, Sukaramukha, Andhakupa, Krimibhojana, Samdamsa, Taptasurmi, Vajrakantaka-salmali, Vaitarani, Puyoda, Pranarodha, Visasana, Lalabhaksa, Sarameyadana, Avichi, Ayahpana, Ksharakardama, Raksogana-bhojana, Sulaprota, Dandasuka, Avata-nirodhana, Paryavartana, and Suchimukha.

bhu, bhuvas, svar, mahas, janas, tapas, and satya above and atala, vitala, sutala, rasātala, talātala, mahātala, pātāla and naraka at the bottom.

Those beings in the higher realms have attained a temporary spiritual liberation due to their positive merits for having strengthened their detachment to the mind, ego and sense objects.

[1] Various early suttas also suggest that there is a close relationship between psychology and cosmology, equating to different levels of existence in the cosmos, which can be interpreted as the afformentioned lokas.

"[20] Jain cosmology postulates an eternal and ever-existing loka which works on universal natural laws, there being no creator and destroyer deity.

[20] In Jain cosmology, on achieving moksha, the soul becomes free of the wordly realm once the fruits of all good and bad karmas have been received.

Rajaloka, Saṁgrahaṇīratna by Śrīcandra, 17th century.
Vishvarupa of Vishnu as the Cosmic Man with the three realms: heaven - Satya to Bhuvar loka (head to belly), earth - Bhu loka (groin), underworld - Atala to Patala loka (legs).
Universe structure as told by Kevalins