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Simpson Bay Lagoon (also spelt Simson Bay Lagoon, or referred to simply as The Great Pond) is one of the largest inland
lagoons A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into ''coastal lagoons'' (or ''barrier lagoons'') an ...
in the
West Indies The West Indies is a subregion of North America, surrounded by the North Atlantic Ocean and the Caribbean Sea that includes 13 independent island countries and 18 dependencies and other territories in three major archipelagos: the Greate ...
of the Caribbean. It is located on the island of Saint Martin. The
border Borders are usually defined as geographical boundaries, imposed either by features such as oceans and terrain, or by political entities such as governments, sovereign states, federated states, and other subnational entities. Political borders c ...
between the French and
Dutch Dutch commonly refers to: * Something of, from, or related to the Netherlands * Dutch people () * Dutch language () Dutch may also refer to: Places * Dutch, West Virginia, a community in the United States * Pennsylvania Dutch Country People E ...
halves of the island runs across the centre of the lagoon. There are two small islands that lie in the lagoon: the larger, Grand Ilet (also known as Explorer's Island) to the north, is within the French region of Saint-Martin; the smaller, Little Key, to the south, is on the Dutch
Sint Maarten Sint Maarten () is a constituent country of the Kingdom of the Netherlands in the Caribbean. With a population of 41,486 as of January 2019 on an area of , it encompasses the southern 44% of the divided island of Saint Martin, while the nort ...
side. The lagoon is connected to the Caribbean sea via a small channel in the north-west which flows into Baie Nettlé in Saint-Martin and another small channel in the south-east which flows into Simson Bay in Sint Maarten. Sint Maarten's airport,
Princess Juliana International Airport Princess Juliana International Airport is the main airport on the Caribbean island of Saint Martin. The airport is located on the Dutch side of the island, in the country of Sint Maarten, close to the shore of Simpson Bay Lagoon. In 2015, the ...
lies close to the lagoon's southern shore.


Environment

The protected waters of this lagoon provide significant seagrass and mangrove habitats, well known juvenile reef fish recruitment areas which likely feed the marine protected areas of Man of War Shoal Marine Park of St. Maarten and the Reserve Naturelle de Saint-Martin.
Mullet Pond
is a section of the Simpson Bay Lagoon which still contains a substantial portion of Red Mangroves ''Rhizophora mangle''. It has been a protected Ramsar site since 2014. Studies have shown that land-based sewage wastewater entering the Lagoon has resulted in bacterial levels far exceeding acceptable norms. Research b
Environmental Protection in the Caribbean (EPIC)
on lagoon and watershed water quality has shown that enterococci bacterial levels exceeded allowable levels in 96% (n=26) of samples. Land-based sites were found to be more polluted than the Lagoon, indicating that a significant portion of contamination originates from the land and not just from boats. With only two narrow channels which permit the flow of fresh water into this large body of water, certain urbanized areas of the lagoon, such as Cole Bay and Marigot, do not experience sufficient water flow to remove or dilute pollutants. High pollution areas therefore frequently exhibit murky or brown water with a foul odor and excessive algal growth and eutrophication. The presence of invasive species, such as the seagrass ''H. stipulacea'', poses additional threats to the lagoon environment.


Economy

St. Maarten's marine industry, centered around the Lagoon, represents 12.5% of the island economy, compared to 9.5% for the Hotel and Restaurant industry (Central Bureau of Statistics). The calm waters of the lagoon make it a safe harbor for vessels seeking repairs, supplies, and protection from hurricanes. The megayacht charter industry is a conspicuous aspect of the yachting sector.


See also

* List of Designated Monuments in Simpson Bay


References

{{coord, 18.052, -63.109, scale:50000, display=title Bodies of water of Saint Martin (island) Lagoons of North America Bodies of water of Sint Maarten Ramsar sites in the Netherlands International lakes of North America Collectivity of Saint Martin–Sint Maarten border Bodies of water of the Collectivity of Saint Martin