Barbados also has an amazing array of sedimentary rock formations and structural geological features, including mud diapirs, the largest of which is in the subsurface of the Scotland District. The highest elevation of Barbados is Mount Hillaby in the Scotland District, 340 m above sea level. Although small by comparison to some of the volcanoes in the islands of the Lesser Antilles, Mount Hillaby, and with it the Scotland District of Barbados, is the summit of an elongated submarine mountain range that is several hundreds km long, extending from Trinidad to about Puerto Rico. The overall shape of the Scotland District is that of a round bowl cut in half by the Atlantic ocean that borders along the straight east coast, with sand beaches and dunes.