Underi Fort, also known as Jaidurg, is a small island fortress located near Alibaug, Maharashtra. It stands as a silent sentinel, guarding the coast and offering a glimpse into the region's rich maritime past. Though smaller than its counterpart Khanderi, Underi boasts impressive fortifications and strategic significance. The fort is largely in ruins, but its walls, bastions, and remnants of structures still evoke a sense of history and intrigue. Reaching Underi requires a short boat ride, adding to the adventure. Visitors can explore the fort's interior, climb its ramparts for panoramic sea views, and imagine the naval battles that once unfolded around it. A visit to Underi is a rewarding experience for history buffs, adventure seekers, and anyone looking to escape the mainland and discover a hidden gem.
Underi Fort's history is intertwined with that of its larger neighbor, Khanderi. Both islands were strategically important for controlling maritime trade and defending against naval threats. Underi was initially fortified by the Siddis of Murud-Janjira in the 17th century. The Marathas, under Shivaji Maharaj, recognized its strategic value and launched several attempts to capture it. Despite fierce battles, the Siddis managed to hold onto Underi for a considerable period. Later, the British gained control of the island and used it as an observation post. Today, the fort stands as a testament to the power struggles that shaped the region's history, a reminder of the naval prowess of different empires vying for control of the Arabian Sea.