Situated amidst the sea and surrounded by water on all sides, Kolaba Fort or Alibaug Fort is one of the most popular tourist attractions in Alibaug. It is a 300-year old fort which was once chief naval stations during the reign of Shivaji Maharaj in Maharashtra. The fort is 25-feet high and only 2 km from the Alibaug shores and is accessible on foot during low tide. The most interesting feature of the fort is that despite being a part of a saltwater body, the fort has a fresh-water well. Book your tickets to admire this isolated yet spectacular military fortification located amidst the Arabian sea!