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Content: On the eastern side of the region's perimeter is the Insular Caribbean: islands of the Greater and Lesser Antilles and the chain of islands in the Bahamas to the north. The states of the United States around the Gulf of Mexico, the littoral zone of Mexico, Central America the northern states of South America complete the terrestrial perimeter that delimits the two main watersheds of the region. In other words, the Wider Caribbean includes the Gulf of Mexico, the Caribbean Sea and adjacent zones of the Atlantic Ocean south of the 30° northern latitude and within the 200 nautical miles of the Atlantic coasts of the states. The boundary nations of the Caribbean Sea are Antigua and Barbuda, Bahamas, Barbados, Belize, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, United States, Grenada, Guatemala, Guyana, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, St. Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Suriname, Trinidad and Tobago, Venezuela and the overseas territories of France, the Netherlands and the United Kingdom. Because of its physical-chemical conditions, the Caribbean Sea has large areas of coral reef and seagrass pasture; 14% of the world's coral reefs are present in this zone (Spalding et al. 2001). In the tropical waters of the Caribbean Sea the average temperature is 27°C and it varies no more than 3°C. Salinity is highest from January to May and lowest from June to December.