CC Madhya 9.310
nānā tīrtha dekhi tāhāṅ narmadāra tīre
Śrī Caitanya Mahāprabhu next arrived at the banks of the river Tāpī. After bathing there, He went to Māhiṣmatī-pura. While there, He saw many holy places on the banks of the river Narmadā.
The river Tāpī is also known as Tāpti. The river’s source is a mountain called Multāi, and the river flows westward through the state of Saurāṣṭra and into the Arabian Sea.
Māhiṣmatī-pura (Maheshwar) is mentioned in Mahābhārata in connection with Sahadeva’s victory. Sahadeva, the youngest brother of the Pāṇḍavas, conquered that part of the country. As stated in the Mahābhārata:
tatra nīlena rājñā sa cakre yuddhaṁ nararṣabhaḥ
“After acquiring jewels, Sahadeva went to the city of Māhiṣmatī, where he fought with a king called Nīla.”