Sindhudurg fort is located to the north of Goa, in Sindhudhurg district. It was built by Shivaji Maharaj in the year 1664 to protect his allies from foreign forces. The fortified walls stretch 2 km along shore line and are about 30 feet high and 12 feet thick. One can find sweet water perennial reservoirs within the fort. There is a branched coconut tree in the fort, unlike other coconut trees with no branches. A secret passage from a nearby temple goes down 3 km under the fort and about 12 km into the sea and again 12 km out from the sea into a nearby village. This special passage was built for women to save themselves in times of enemy attack. The meticulously built fort can be approached only by water or air or through water hidden rocks on the shore. These are not visible to the naked eye, making navigation difficult and can even wreck the boat. About 15 families reside within the fort, who earn by fishing, farming and guiding tourists.