The Great Barrier Reef, located off the coast of Australia, is the largest coral reef system in the world, stretching over 2,300 kilometers.

Coral reefs are primarily built by tiny marine invertebrates called coral polyps, which secrete a hard exoskeleton made of calcium carbonate.

Coral polyps and algae have a mutualistic relationship, where the algae provide the coral with food through photosynthesis, and the coral provides the algae with a protected environment and nutrients.

Coral bleaching occurs when corals expel the symbiotic algae living within their tissues, causing them to turn white and become more susceptible to stress and disease.

Overfishing, pollution, climate change, and unsustainable tourism are all major threats to coral reefs, causing coral bleaching, habitat destruction, and reduced biodiversity.

Coral reefs provide food and shelter for a diverse range of marine life, protect coastlines from erosion by acting as natural barriers, regulate ocean temperatures, and contribute to oxygen production.

Parrotfish play a crucial role in maintaining coral reef health by consuming algae, preventing it from overgrowing and smothering the corals.

Coral restoration involves active measures to restore damaged coral reefs, such as transplanting corals, removing invasive species, and reducing human impacts.

Indonesia has the largest area of coral reefs in the world, covering approximately 18% of the global total.

An atoll is a ring-shaped coral reef that encircles a central lagoon, often formed when a volcanic island subsides and the coral continues to grow upward.

The Mesoamerican Barrier Reef is the second-largest coral reef system in the world, stretching along the coastlines of Mexico, Belize, Guatemala, and Honduras.

Scleractinia is the scientific name for the order of stony corals that are responsible for building most coral reefs.

The Andaman and Nicobar Islands Coral Reef is located in the Bay of Bengal, stretching along the coastlines of the Andaman and Nicobar Islands.

A fringing reef is a coral reef that grows directly from the shoreline of a mainland or island, forming a narrow band along the coast.

The Red Sea Coral Reef is located along the coastlines of Egypt, Saudi Arabia, Sudan, and Yemen, and is known for its rich biodiversity.