Prabalgad Fort is located between Matheran and Panvel in the Indian state of Maharashtra, at an elevation of 2300 feet in the Western Ghats. It was built on a plateau very close to Matheran, but unlike Matheran it does not have a good source of water. It was known as Muranjan until it was taken over and renamed by the Maratha forces under Shivaji's rule. The fort contains a temple to Ganesh and some stone ruins. Its sister fort is Irshalgad.
Prabalgad fort, or Muranjan fort in its present form, was built during Bahmani Sultanate to keep an eye on Panvel Fort and Kalyan Fort in North Konkan. Around 1458 AD, Malik Ahmad, the prime minister of the kingdom of Ahmednagar, took over the fort during his conquest of Konkan. After disintegration of Bahmani Sultanate, this fort remained with the Ahmadnagar Sultanate. During the collapse of the Ahmadnagar Sultanate, Shahaji tried helping them unsuccessfully against the separate forces of the Mughal Empire and the Adil Shahi dynasty and moved to Muranjan, along with wife Jijabai and younger son Shivaji for a brief period. However following Shahaji's defeat and agreement of Mahuli, North Konkan, along with this fort, was ceded to Mughals who granted ruling authority of the area to Adilshah of Bijapur. The fort was conquered by Shivaji from the Mughals in 1657, after he establishing himself in the Kalyan-Bhivandi area. At the time of the attack the fort was governed by Kesar Singh, a Mughal sardar, and was the only fort to put up a strong resistance. On seeing the signs of defeat the women in the fort performed Jauhar, a tradition of self-immolation to ensure an honorable and respectful death. Singh died during the battle in October 1657. Singh's mother hid herself and her grandchild during the attack. Shivaji in an act of kindness made sure the lady and the child were allowed a safe passage out.
Prabalgad lies on the Prabal plateau between Matheran and Panvel and can be seen from the Mumbai-Pune Expressway. The Ulahas River runs to the east of the fort. The Gadhi River, and the Chanderi and Peb forts are to the west. To the south is the Patalganga River, and Manikgad and to the north is the Karnala fort.
Kelve Teen (also known as Kalavantin or Kalavantinicha Sulka) is a 500m high pinnacle on the northern edge of the Prabal plateau. It is located near the Machi and Vajepur villages.
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- For high resolution image of Kalavantin durg see 250 MegaPixel image of Kalavantin.