Tuvalu
Geography

Tuvalu is a volcanic archipelago, and consists of three reef islands (Nanumanga, Niutao and Niulakita) and six true atolls (Funafuti, Nanumea, Nui, Nukufetau, Nukulaelae and Vaitupu). Its small, scattered group of low-lying atolls have poor soil and a total land area of only about 26 square kilometres (10 square miles) making it the fourth smallest country in the world. The highest elevation is 4.6 metres (15 ft) above sea level on Niulakita; however the low-lying atolls and reef islands of Tuvalu are susceptible to seawater flooding during cyclones and storms. The sea level at the Funafuti tide gauge has risen at 3.9 mm per year, which is approximately twice the global average. However, over four decades, there had been a net increase in land area of the islets of 73.5 ha (2.9%), although the changes are not uniform, with 74% increasing and 27% decreasing in size. A 2018 report stated that the rising sea levels are identified as creating an increased transfer of wave energy across reef surfaces, which shifts sand, resulting in accretion to island shorelines. The Tuvalu Prime Minister objected to the report's implication that there were "alternate" strategies for Islanders to adapt to rising sea levels, and criticised it for neglecting issues such as saltwater intrusion into groundwater tables as a result of sea level rise.

Funafuti is the largest atoll, and comprises numerous islets around a central lagoon that is approximately 25.1 kilometres (15.6 miles) (N–S) by 18.4 kilometres (11.4 miles) (W-E), centred on 179°7'E and 8°30'S. On the atolls, an annular reef rim surrounds the lagoon with seven natural reef channels. Surveys were carried out in May 2010 of the reef habitats of Nanumea, Nukulaelae and Funafuti; a total of 317 fish species were recorded during this Tuvalu Marine Life study. The surveys identified 66 species that had not previously been recorded in Tuvalu, which brings the total number of identified species to 607. Tuvalu's exclusive economic zone (EEZ) covers an oceanic area of approximately 900,000 km.

Tuvalu signed the Convention on Biological Diversity (CBD) in 1992, and ratified it in December 2002. The predominant vegetation type on the islands of Tuvalu is the cultivated coconut woodland, which covers 43% of the land. The native broadleaf forest is limited to 4.1% of the vegetation types. Tuvalu contains the Western Polynesian tropical moist forests terrestrial ecoregion.
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