Grenada is an island country consisting of Grenada itself and six smaller islands at the southern end of the Grenadines in the southeastern Caribbean Sea. The islands are of volcanic origin with extremely rich soil. Grenada's interior is very mountainous with Mount St. Catherine being the highest at 840 m (2,760 ft). Several small rivers with beautiful waterfalls flow into the sea from these mountains. It is also known as "Island of Spice" because of the production of nutmeg and mace crops of which it is one of the world's largest exporters.