Along the Konkan coastline of western India, maritime trade was long dominated by foreign powers and regional adversaries, most notably the Siddis of Janjira, the Portuguese in Goa, and the English East India Company. Chhatrapati Shivaji Maharaj recognized early in his military career that control of the land alone was insufficient to secure his sovereign kingdom (Swarajya). He famously understood that securing the coastline was essential to prevent foreign encirclement, protect native merchant shipping, and curb hostile raids. To establish a permanent naval stronghold in the southern Konkan, Shivaji selected Kurte Island—a rocky islet situated off the coast of Malvan in modern-day Maharashtra.
On November 25, 1664, Shivaji formally commissioned the construction of Sindhudurg (the 'Fortress of the Ocean'). Under the master architectural supervision of Hiroji Indulkar, the construction presented immense engineering challenges due to relentless ocean currents, rocky seabed geology, and saltwater erosion. Over 100 Portuguese engineers and expert local Indian stonecutters were engaged to design defensive bulwarks that could withstand ocean surges and naval cannonades. To anchor the outer walls into the submerged bedrock against oceanic wave action, massive quantities of molten lead—exceeding 80,000 kilograms—were poured directly into the rock foundations, a remarkable technological feat in 17th-century South Asia.
The fortress was built over three years with a dedicated workforce of stonemasons, carpenters, and sailors, directed by Hiroji Indulkar and naval commanders like Maynak Bhandari and Daryasarang Daulat Khan. The finished sea fort featured over three kilometers of high stone ramparts, 42 formidable bastions, and a ingeniously concealed main gate (Maha Darwaja) designed to deceive approaching hostile fleets. Its completion provided the emerging Maratha Navy with a protected deep-water base from which to patrol the Arabian Sea, levy duties on foreign vessels, and counter Siddi naval dominance.
The establishment of Sindhudurg marked the formal rise of native Indian naval power, earning Shivaji the title of 'Father of the Indian Navy.' It transformed the Maratha state from a land-based guerrilla force into a multi-domain power capable of projecting influence across maritime trade routes. Today, Sindhudurg stands as an enduring monument to 17th-century military engineering and maritime vision, preserving unique historical relics including the handprints and footprints of Shivaji Maharaj embedded in stone slabs within the fortress complex.
Why it matters
The commissioning of Sindhudurg Fort marked the birth of a sovereign Maratha naval doctrine designed to challenge European and Siddi maritime dominance along India's western coast. Shivaji Maharaj recognized that long-term sovereignty required controlling oceanic trade lanes as well as mountain passes. Sindhudurg became the flagship anchor of a chain of coastal fortifications that protected the Konkan economy and laid the foundation for modern Indian naval defense strategies.
Interesting fact
To ensure the fortress foundations could withstand severe wave erosion and seawater degradation, over 80,000 kilograms (hundreds of tons) of molten lead were poured into underwater rock fissures before laying the foundation stones.
People
- Chhatrapati Shivaji MaharajFounder of the Maratha Empire who commissioned the naval fort
- Hiroji IndulkarMaster architect and chief engineer of the fortification work
- Maynak BhandariMaratha naval commander involved in coastal defense operations
Location
Sindhudurg Fort · Malvan · India
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