Sindhudurg is a fortress which occupies an islet in the Arabian Sea, just off the coast of Maharashtra in western India. The fortress lies on the shore of Malwan town of Sindhudurg District in the Konkan region of Maharashtra, south of Mumbai. It is a protected monument.
One of the best preserved forts of the Marathas, Sindhudurg fort has zigzag rampart with 42 bastions. Apart from the huge stones, the building material involved 2000 khandis (72,576 kg) of iron erecting the massive curtain wall and bastions. A notable feature is that the foundation stones were laid down firmly with 5 khandis (181.5 kg) of molten lead.