Anastasia Island is a barrier island located off the northeast Atlantic coast of Florida. It sits east of St Augustine, running north-south in a slightly southeastern direction to Matanzas Inlet.

Santa Anastasia is about 14 miles long and an average of 1 mile in width. It is separated from the mainland by the Matanzas River, part of the Intracoastal Waterway. Matanzas Bay, the body of water between the island and downtown St Augustine, opens into St Augustine Inlet.

Source: Santa Anastasia – the Island of Adventure – HISTORIC CITY NEWS
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