Grenada is the largest of the three island nation which includes Grenada, Carriacou and Petit Martinique. Carriacou is smaller and located to the northeast of Grenada. Petit Martinique is just to the east of Carriacou. All three islands are volcanic in origin with an active submarine volcano, Kick’em Jenny, found between Grenada and Carriacou. The narrow island shelf supports a variety of coral reefs, seagrass beds, sandy beaches and mangrove stands.