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In the Harivamsha Purana,
A mountain known as Swayamprabha, situated in the middle of the Swayambhuraman island, shines brightly in the form of a ring. || 730 || Between the Manushottara and Swayamprabha mountains, there are countless islands inhabited by Tiryanchas, whose inferior Bhogabhumi resembles that of Tiryanchas. || 731 || Beyond the Swayamprabha mountain, there are Tiryanchas who are similar to the Karmabhumij Tiryanchas, as there are countless Tiryanchas who are both Sanayata and Asanayata - Deshavratis. || 732 || In the aforementioned island seas and on the beautiful mountains, Vyantar Devas like Kinnaras reside as per their respective nature. || 733 || Gautama Swami says, "O Shrenika! You have now understood the Prajnapti related to the island seas. Now listen to the Prajnapti related to the Jyotirloka and Udhvaloka in brief." || 734 || This clear collection of the Prajnapti related to the Jambudvipa and the Lavanasamudra, as well as the best of islands and seas, is accepted by the Munis. Whoever listens to this, their doubts regarding the Bhuloka are destroyed. This is indeed true. For when the sun, in the form of a Muni, rises, how can the group of darkness remain? It cannot. || 735 ||
Thus ends the fifth chapter of the Harivamsha Purana, composed by Jinaseanacharya, which contains a collection of the Arishta-nemi Purana and describes the island seas.