The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the Coral Sea, off the coast of Queensland, Australia, separated from the coast by a channel 160 kilometres (100 mi) wide in places and over 61 metres (200 ft) deep. The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms. This reef structure is composed of and built by billions of tiny organisms, known as coral polyps. It supports a wide diversity of life and was selected as a World Heritage Site in 1981. CNN labelled it one of the Seven Natural Wonders of the World in 1997. Australian World Heritage places included it in its list in 2007. The Queensland National Trust named it a state icon of Queensland in 2006.
Mafia Island or Chole Shamba is an island of The Mafia Archipelago located in Mafia District in the southern Pwani Region of Tanzania across the Mafia Channel. The island is the third largest in Tanzanian ocean territory, but is not administratively included within the semi-autonomous region of Zanzibar, which has been politically separate since 1890. Mafia Island forms the largest part of Mafia District, one of the six administrative districts in the Pwani Region. As the Mafia Archipelago's main island, it's sometimes called Chole Shamba, meaning Chole farmlands in Swahili. This is in opposition to the historic settlement of Chole Mjini on Chole Island inside Mafia Bay. The island's population is over 65,000. The economy is based on fishing, subsistence agriculture and the market in Kilindoni. The island attracts some tourists, mainly scuba divers, birdwatchers, game fishermen, and people seeking relaxation.
Coral bleaching is the process when corals become white due to loss of symbiotic algae and photosynthetic pigments. This loss of pigment can be caused by various stressors, such as changes in temperature, light, or nutrients. Bleaching occurs when coral polyps expel the zooxanthellae that live inside their tissue, causing the coral to turn white. The zooxanthellae are photosynthetic, and as the water temperature rises, they begin to produce reactive oxygen species. This is toxic to the coral, so the coral expels the zooxanthellae. Since the zooxanthellae produce the majority of coral colouration, the coral tissue becomes transparent, revealing the coral skeleton made of calcium carbonate. Most bleached corals appear bright white, but some are blue, yellow, or pink due to pigment proteins in the coral.
Southeast Asian coral reefs have the highest levels of biodiversity for the world's marine ecosystems. They serve many functions, such as forming the livelihood for subsistence fishermen and even function as jewelry and construction materials. Corals inhabit coastal waters off of every continent except Antarctica, with an abundance of reefs residing along Southeast Asian coastline in several countries including Indonesia, the Philippines, and Thailand. Coral reefs are developed by the carbonate-based skeletons of a variety of animals and algae. Slowly and overtime, the reefs build up to the surface in oceans. Coral reefs are found in shallow, warm salt water. The sunlight filters through clear water and allows microscopic organisms to live and reproduce. Coral reefs are actually composed of tiny, fragile animals known as coral polyps. Coral reefs are significantly important because of the biodiversity. Although the number of fish are decreasing, the remaining coral reefs contain more unique sea creatures. The variety of species living on a coral reef is greater than anywhere else in the world. An estimation of 70-90% of fish caught are dependent on coral reefs in Southeast Asia and reefs support over 25% of all known marine species. However, those sensitive coral reefs are facing detrimental effects on them due to variety of factors: overfishing, sedimentation and pollution, bleaching, and even tourist-related damage.
Saint Martin Island is a small island in the northeastern part of the Bay of Bengal, about 9 km south of the tip of the Cox's Bazar-Teknaf peninsula, and forming the southernmost part of Bangladesh. There is a small adjoining island that is separated at high tide, called Chera Dwip. It is about 8 kilometres west of the northwest coast of Myanmar, at the mouth of the Naf River.
Unguja South Region, Zanzibar South Region or South Zanzibar Region is one of the 31 regions of Tanzania. The region covers an area of 854 km2 (330 sq mi). The region is comparable in size to the combined land area of the nation state of Kiribati. and the administrative region is located entirely on the island of Zanzibar. Unguja South Region is bordered on three sides to the south by Indian Ocean, northeast by Unguja North Region and northwest by Mjini Magharibi Region. The regional capital is the town of Koani. Besides being known for its Spinner dolphin populations, the region is also home to the oldest mosque in East Africa, the Kizimkazi Mosque and also historic Makunduchi town. The region has the fourth highest HDI in the country, making one of the most developed regions in the country. According to the 2022 census, the region has a total population of 195,873.
Chumbe Island is a private island in the Mjini Magharibi Region, Tanzania, off the coast of Mjini District. It is situated in the Zanzibar Channel. The island is known for its ecological innovation and exceptional coral reefs. The Chumbe Lighthouse is also located on the island.
The Dar es Salaam Marine Reserve System or DMRS is a group of marine reserves in Tanzania, with the IUCN category II located within Dar es Salaam Region of Tanzania. The reserve system consists of nine uninhabited islands, four located north of Dar es Salaam's Kinondoni District; and four south of the city Makatumbi Islands, Kimbubu Island, Sinda Island and Kendwa Island in Kigamboni District. It provides protection for several important tropical ecosystems; coral reefs, mangroves and seagrass beds.
Pangavini Island is a protected, uninhabited island under the Dar es Salaam Marine Reserve with the IUCN category II located within Kinondoni District of Dar es Salaam Region in Tanzania. The island reserve measures around 2.13km2. Pangavini is the smallest island in the group, only about 250 m long; it has a rocky coastline without beaches. To the west of the island is Kunduchi ward and to the north is Mbudya Island. To the south of the island is Bongoyo Island.
Fumba is a village on the Tanzanian island of Unguja, part of Zanzibar. It is located in the southwest of the island, at the end of the Fumba Peninsula, and overlooks Menai Bay in Mjini Mgaharibi Region.
Human activities have substantial impact on coral reefs, contributing to their worldwide decline.[1] Damaging activities encompass coral mining, pollution, overfishing, blast fishing, as well as the excavation of canals and access points to islands and bays. Additional threats comprise disease, destructive fishing practices, and the warming of oceans.[2] Furthermore, the ocean's function as a carbon dioxide sink, alterations in the atmosphere, ultraviolet light, ocean acidification, viral infections, the repercussions of dust storms transporting agents to distant reefs, pollutants, and algal blooms represent some of the factors exerting influence on coral reefs. Importantly, the jeopardy faced by coral reefs extends far beyond coastal regions. The ramifications of climate change, notably global warming, induce an elevation in ocean temperatures that triggers coral bleaching—a potentially lethal phenomenon for coral ecosystems.
The wildlife of Zanzibar consists of terrestrial and marine flora and fauna in the archipelago of Zanzibar, an autonomous region of Tanzania. Its floral vegetation is categorized among the coastal forests of eastern Africa as the Southern Zanzibar-Inhambane coastal forest mosaic and the Northern Zanzibar-Inhambane coastal forest mosaic. Its faunal species are mostly small animals, birds, and butterflies.
The Menai Bay Conservation Area (MBCA) is located in Menai Bay, Zanzibar Tanzania. At 470 square kilometres (180 sq mi), it is Zanzibar's largest marine protected area. It was officially established as a conservation area in August 1997 in the traditional fishing area, known as Unguja Island, covering the tropical marine environment comprising extensive coral reefs, tropical fish, sea grasses, and mangrove forests. In addition to controlling illegal fishing, MBCA's alternative initiatives have included bee keeping, mangrove replanting, tree nurseries and tourism. The management of the MBCA falls upon the Fisheries Department and the bay's local villages. It is rated by the IUCN as Category VI Managed Resource Protected Area.
The resilience of coral reefs is the biological ability of coral reefs to recover from natural and anthropogenic disturbances such as storms and bleaching episodes. Resilience refers to the ability of biological or social systems to overcome pressures and stresses by maintaining key functions through resisting or adapting to change. Reef resistance measures how well coral reefs tolerate changes in ocean chemistry, sea level, and sea surface temperature. Reef resistance and resilience are important factors in coral reef recovery from the effects of ocean acidification. Natural reef resilience can be used as a recovery model for coral reefs and an opportunity for management in marine protected areas (MPAs).
Cape Byron Marine Park is one of four marine parks in New South Wales, Australia, and is the most recently sanctioned. The Cape Byron Marine Park is located in Northern NSW and extends 37 kilometres (23 mi) from the Brunswick River to Lennox Head. The marine park extends out to 3 nautical miles which dictates the border between state and federal jurisdiction. The marine park covers an area of 220 square kilometres (85 sq mi) and includes a variety of marine terrain including beaches, rocky shores, open ocean and the tidal waters of the Brunswick River and its tributaries, the Belongil Creek and Tallow Creek. The Cape Byron Marine Park was declared in 2002 and the zoning plan was implemented in April 2006. Of the 15 distinct marine ecosystems identified within the Tweed-Moreton bioregion, the Cape Byron Marine Park supports 10 of these.
The island of Tobago has multiple coral reef ecosystems. The Buccoo Reef, the Culloden Reed and Speyside Reef are the three largest coral reef marine ecosystems in Tobago. The Buccoo Reef is a coralline reef ecosystem that is located on the southwestern region of Tobago. It is a popular ecotourism attraction where tourists can snorkel and see the coral reefs and schools of fish without diving equipment. The Trinidad and Tobago Tourism Ministry estimates that 90% of its tourists visit the Buccoo Reef while exploring Tobago. The Buccoo Reef, also known as the Buccoo Reef Complex, spans 7 km2 and has five reef flats that can reach up to 25 metres in depth. The reef complex has been designated as part of a protected Ramsar site since 2005.
The coral reefs of Tuvalu consist of three reef islands and six atolls, containing approximately 710 km2 (270 sq mi) of reef platforms. The islands of the Tuvalu archipelago are spread out between the latitude of 5° to 10° south and longitude of 176° to 180°, west of the International Date Line. The islands of Tuvalu are volcanic in origin. On the atolls, an annular reef rim surrounds the lagoon, and may include natural reef channels. The reef islands have a different structure to the atolls, and are described as reef platforms as they are smaller tabular reef platforms that do not have a salt-water lagoon, although they may have a completely closed rim of dry land, with the remnants of a lagoon that has no direct connection to the open sea or that may be drying up.
Tutia Reef is a system of protected coral reefs inside the Mafia Island Marine Park (MIMP) with the IUCN category II designation. The reef is located on Tanzania's Mafia Archipelago of Mafia District in southern Pwani Region of Tanzania. Tutia Reef is rated as the country's top spot for sport fishing, however the reef is also the site some of the worst coral bleaching events in history in 1998. The reef is located south west of Jibondo Island inside the Mafia Channel.
The Tanga Marine Reserves System (TMRS) is a group of marine reserves in the Tanga Region of Tanzania. All TMRs, though, serve as significant sea bird breeding areas. The Tanga Marine Reserves are: Kirui Island, Maziwe Island, Ulenge Island, Kwale Island and Mwewe Island.
Ukombe Island is a protected island located in Dimani ward of Mjini District in Mjini Magharibi Region, Tanzania. The island is part of the Menai Bay Marine Conservation Area.
