Q. Which sea fort built by Shivaji Maharaj gives Sindhudurg district its name?
Answer: Sindhudurg Fort
Notes: Sindhudurg district is named after Sindhudurg Fort, built by Shivaji Maharaj between 1664-1667, located on an islet off Malvan. It is one of Maharashtra's famous sea forts, constructed to safeguard the Konkan coast, and remains a prominent historical monument in the state.