Prithu Maharaja was leveling the rough places of the earth by cutting down the hills. As he began leveling this area, great effulgence came forth. When the workers told this to Prithu Maharaja, he came to see the phenomenon. As he was a śaktyāveśa-avatāra, an empowered incarnation, by meditation he understood that this place was Navadvipa. He kept the glories of this place secret at that time and ordered that a kunda be established there. This kunda thus became celebrated as Prithukunda throughout Navadvipa-dhama. The villagers felt indescribable bliss by drinking the pure water of this kunda. Later, King Laksmana Sena dug out the kunda and made it bigger and deeper. Desiring to deliver his forefathers, he named it Ballal-dighi [after his father, Ballal Sena]. (Although it is no longer visible, Prithu-kunda was formerly situated between Murari Gupta’s house and the Chaitanya Matha. When one leaves Srivasa Angana and walks away from Mayapur on the Bhaktisiddhanta Road, just before reaching the Chaitanya Matha a large paddy field is seen, which marks the location of Prithu-kunda).
Sri Navadvip Dhama Mahatmya, Chapter Six, Śrī Gaṅgānagara, Prithukuṇḍa, Sīmantadvīpa, Śaraśāṅgā, Viśrāma-sthāna