Mahabharata Shalya Parva Chapter 47:2

Mahabharata Shalya Parva (Gada Yuddha Parva) Chapter 47:2 The intelligent Balarama, having bathed there, then proceeded to Brahmayoni where the adorable Grandsire of all the worlds had exercised his functions of creations. In days of yore, the Lord Brahman, along with all the gods, bathed in that tirtha, according to due rites for the celestials. Bathing there and giving away diverse kinds of gifts, Valadeva then proceeded to the tirtha called Kauvera where the puissant Ailavila, having practised severe austerities, obtained, O king, the Lordship over all treasures. While he dwelt there (engaged in austerities), all kinds of wealth, and all the precious gems came to him of their own accord. Baladeva having repaired to that tirtha and bathed in its waters duly gave much wealth unto the Brahamanas. Rama beheld at that spot the excellent woods of Kuvera. In days of yore, the high-souled Kuvera, the chief of the Yakshas, having practised the severest austerities there, obtained many boons. There were the lordship of all treasures, the friendship of Rudra possessed of immeasurable energy, the status of a god, the regency over a particular point of the compass (the north), and a son named Nakakuvera. These the chief of the Yakshas speedily obtained there, O thou of mighty arms! The Maruts, coming there, installed him duly (in his sovereignty). He also obtained for a vehicle a well-equipped and celestial car, fleet as thought, as also all the affluence of a god. Bathing in that tirtha and giving away much wealth, Vala using white unguents thence proceeded quickly to another tirtha. Populous with all kinds of creatures, that tirtha is known by the name Vadarapachana. There the fruits of every season are always to be found and flowers and fruits of every kind are always abundant."