Tidewater Rock is a fortified tower over 70 feet tall built on the rocky shore of Windward Isle. It is made of sturdy masonry walls atop a 10-foot-high stone base, filled with packed dirt. A stone stair rises to the heavy front door. Tidewater Rock sits right on the lagoon's edge and commands a good view of almost the entire island. At high tide, the water rises almost to the height of its stone base. The current owner of the Rock is Agasta Smythee, widow of the pirate Iron Bert Smythee.