The St. Johns River is one of three in the world that runs north. The longest river in Florida, it is significant for commercial and recreational use. For 310 miles it winds through or borders 12 counties and is nearly three miles across in places. Seawater and freshwater mix at the lower St. Johns River estuary, creating brackish (part salt, part fresh) water that is home to a variety of fish, including sharks, porpoises, redfish, and rays in the north, while largemouth bass, sheepshead, crappie, bluegills, shellcrackers, and catfish are found in the freshwater farther south.
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