What is "prabalgad"

Prabalgad Fort, also known as Muranjan and Pradhangad, 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. Right next to Prabalgad, to its north, lies the steep Kalavanti (also known as Kalavantin) Fort. Prabalgad is often confused with Kalavati, but they are two separate forts.