Naraka (Sanskrit: नरक) is the realm of existence in Jain cosmology characterized by great suffering. Naraka is usually translated into English as "hell" or "purgatory". However, Naraka differs from the hells of Abrahamic religions as souls are not sent to Naraka as the result of a divine judgment and punishment. Furthermore, the length of a being's stay in a Naraka is not eternal, though it is usually very long—measured in billions of years. A soul is born into a Naraka as a direct result of his or her previous karma (actions of body, speech and mind), and resides there for a finite length of time until his karma has achieved its full result. After his karma is used up, he may be reborn in one of the higher worlds as the result of an earlier karma that had not yet ripened.
These realms are situated in the seven lower levels (adho lok) of the universe while the human abode of Jambudvip is in the middle (madhya lok) and the heavenly realms exist above (urdhva loka). These layers together, form the shape of a man with arms akimbo (the familiar 'keyhole' shaped emblem of Jainism), with the human realm of Jambudvip at the waist, adho lok below, urdhva lok above, and siddha lok or siddhashila (the realm of the siddhas) at or above the head. Many Jain temples are built to display this cosmology such Jambudvip in Hastinapur and the fifteen story Trilok Teerth Dham temple in Uttar Pradesh. The seven lower grounds are:
The first ground, owing to a predominance of ratnas or jewels, is called Ratnaprabha. Similarly, the second, owing to a predominance of sarkara or gravel, is called Sarkraprabha. The third owing to a predominance of valuka or sands, is called Valukaprabha. The fourth, owing to an excess of panka or mud, is called Pankaprabha. The fifth, owing to an excess of dhuma or smoke, is called Dhumaprabha. The sixth, owing to a marked possession of tamas or darkness, is called Tamahprabha, while the seventh, owing to a high concentration of mahatamas or dense darkness, is called Mahatamahprabha.