The island of Grenada (Commonwealth of Grenada) is a constitutional monarchy associated with the British Commonwealth, the state, located in the Lesser Antilles, between the Caribbean Sea to the west and the Atlantic Ocean to the east, north of Trinidad and Tobago, and south of Saint Vincent and the Grenadines, consists of the island of Grenada and the Southern Grenadines, the capital and main port is the city of Saint George's located along the southwestern coast of Grenada. The island of Grenada (311 square kilometres) is a mountainous island of volcanic origin, the highest mountain is the Mount St. Catherine (840 metres). In the Grenadines among those belonging to Grenada, the largest island is Carriacou (33 sq km), also an island of volcanic origin, other islands are Ronde Island and Petit Martinique. The economy of the islands is based on agriculture (nutmeg, of which Granada is the second largest world producer, and other spices like cinnamon, cloves and ginger, then cocoa, citrus fruits, bananas, nuts coconut, cane sugar), fisheries and tourism.