Pūrimatālā (also written Purimatala / Purimtal) is an ancient Jain place associated with Ayodhyā region.

In Jain tradition:

• It is described as a branch city of Ayodhyā.
• Many scholars identify it with the Prayāg / Allahābād area.
• It is counted among the “kalyāṇak-bhūmī” – places where important auspicious events (kalyāṇaks) of Tirthankars happened.
• In some Jain texts, Bhagwān Ṛṣabhdev (Ādināth) is linked with Purimatala (particularly for dīkṣā / major events of his life).
• Later Jain literature also mentions a temple of a Tirthankar (e.g. Mallināth Bhagwān) at Purimatala, built when it was a flourishing Jain centre. ( hinduismatoz.com)

So in simple words: Pūrimatālā is an ancient Jain holy place near today’s Prayāg (Allahābād), connected with Ayodhyā and remembered as a kalyāṇak-bhūmi of Tirthankars, especially Ṛṣabhdev.

For background on Bhagwān Ṛṣabhdev’s life and kalyāṇaks you can read more here: