Saint Thomas Lowland is one of 5 Nevis parishes which are in turn part of the 14 administrative parishes that make up the Federation of Saint Kitts and Nevis. Leeward Islands, Lesser Antilles, West Indies.The coast of this parish consists primarily of sand beaches, most notably the 3-mile long Pinney's Beach. Behind the sandy coastline are several small lagoons, including the freshwater lagoon of Nelson's Spring, which is next to the village of Cotton Ground.