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st_johns_river The St. Johns River is the longest river in Florida and it’s most significant for commercial and recreational use. At 310 miles long, it winds through or borders twelve counties, three of which are the state’s largest. The drop in elevation from the headwaters to the mouth is less than 30 feet. Like most Florida waterways, the St. Johns has a very slow flow rate at a third of a mile an hour, and is often described as “lazy”.  It is one of a small number of rivers in the United States to run north. Numerous lakes are formed by the river or flow into it.