Caribbean Sea

The Caribbean Sea is a massive body of water in the North Atlantic Ocean. It sits within the tropics of the Western Hemisphere.

The sea is located south of the Gulf of Mexico. To the north, the Greater Antilles islands form a boundary. To the east, the Lesser Antilles islands stretch toward the Atlantic. South America borders the sea to the south. Central America and the Yucatán Peninsula lie to the west. This entire region, including many islands, is known as the Caribbean.

Geologically, the Caribbean Sea sits atop the Caribbean Plate. This oceanic sea formed millions of years ago. Scientists estimate it is between 160 million and 180 million years old. It began when a fracture in the supercontinent Pangaea split the land apart. During the Jurassic period, deep basins emerged through a process called rifting. This rifting helped create the Atlantic Ocean. Over time, the sea took a shape very close to what we see today.

The seafloor is not one flat surface. It is divided into five distinct basins. These are the Yucatan, Cayman, Colombian, Venezuelan, and Grenada Basins. Underwater ridges and mountain ranges separate these basins. For example, the Cayman Ridge and the Nicaraguan Rise act as boundaries. The deepest parts of the sea are found in the Cayman Trough. This trough sits between Jamaica and the Cayman Islands. The sea also contains two oceanic trenches. These are the Cayman Trench and the Puerto Rico Trench.

Tectonic activity makes this region very dynamic. The South American Plate pushes against the Caribbean Plate. This pressure creates island arcs and volcanic activity. Some volcanoes in the Lesser Antilles are active. Examples include Mount Pelee and La Soufrière. This movement also causes frequent earthquakes. In the last 500 years, the area has had twelve earthquakes with a magnitude of 7.5 or higher. A major 7.1-magnitude earthquake struck Haiti in 2010. These underwater movements can also generate dangerous tsunamis.

Human history in the Caribbean is deeply tied to its waters. The name "Caribbean" comes from the Caribs. They were a dominant group of native people during European contact. In 1492, Christopher Columbus sailed into these waters.

He was searching for a sea route to Asia. After his arrival, Spain began to colonize the region. Later, England, France, and the Dutch Republic also established presence. The sea became a vital hub for maritime trade. This wealth and activity eventually attracted famous pirates like Blackbeard.

The oceanography of the sea is quite consistent. The water surface appears blue-green or green.

Salinity levels are about 3.6%. The water temperature stays mostly stable throughout the year. However, the sea has entered a warming phase recently. Over the last 50 years, the water has gone through cooling and warming cycles. These changes are often linked to El Niño and La Niña phenomena. The Guiana Current and the North Equatorial Current help move water through the sea.

One of the most vital features is the coral reef system. The Caribbean holds about 9% of the world's coral reefs.

The Mesoamerican Barrier Reef is a massive example. It is the second-largest barrier reef on Earth. It runs along the coasts of Mexico, Belize, Guatemala, and Honduras.

These reefs are essential for the local economy. They support fishing and scuba diving, worth billions of dollars. They also provide habitats for diverse marine life.

Environmental changes pose a threat to these ecosystems. Tiny plants called zooxanthellae live inside coral tissues. These plants provide food and color to the coral. When the water becomes too warm, these plants die off. This process is called coral bleaching. It can devastate entire reef systems. Currently, many corals are experiencing whitening. To help, 15 countries have joined a convention to protect the marine environment. This effort aims to stop human activities that destroy these fragile habitats.