Assertion: river delta | /r/MadeOf | 37% of the estuarine marsh
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text: The Mississippi River Delta is the 7th largest river delta on Earth (USGS) and is an important coastal region for the United States, containing more than 2.7 million acres (4,200 sq mi; 11,000 km2) of coastal wetlands and 37% of the estuarine marsh in the conterminous U.S.