The parish's 5 mile coastline is one of the most impressive and varied in the federation. The northern coasts consist of long beaches with black volcanic sand. Large offshore reef formations almost completely surround Dieppe Bay Beach, creating the island's safest natural harbour. The other beaches, namely Parson's Beach and Sandy Bay, however, lack this protection and are battered by the turbulent waves of the Atlantic Ocean. The southern coasts contain one of the island's most noted natural features, Black Rocks. Stretching for almost 2 miles, these large metamorphic rock projections are the result of St. Kitts' last volcanic eruption (estimated to be in the 14th century) when lava poured down the slopes of Mount Liamuiga creeping until it met the Atlantic Ocean, where it cooled and hardened. Shaped and formed by wave action over the years, the many grottoes, pools and projections that now line the area are a testament to the island's volcanicity. Saint John Capisterre is also home to the tallest peak in the Leeward Islands, Mount Liamuiga, whose crater lake marks the boundary for Saint Paul Capisterre, Saint Anne Sandy Point and Saint Thomas Middle Island. The parish's interior is completely dominated by Liamuiga and other peaks of the North West and Central Ranges, covered with tropical forests. Below 1000 feet, the forests give way to small farm holdings and abandoned sugar cane estates. The parish is a main producer for tropical fruit on the island.