Guana Tolomato Matanzas (GTM) National Estuarine Research Reserve is the newest reserve in the national system. It is geographically separated into a northern section, where the Tolomato and Guana rivers meet the Atlantic Ocean, and a southern section at the mouth of the Matanzas River.
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The reserve is divided by the city of St. Augustine, Fla. It stretches approximately 30 miles north and 30 miles south of city, in St. Johns and Flagler counties.
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