The St.Johns is navigable from Sanford to its mouth, a distance of some 200 miles (320 km). It becomes a broad estuary north of Palatka and east of Jacksonville, where it has its deepest channel at about 40 feet (12 metres) and is a marsh.
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The Blackwater River is unmodified by dams and reservoirs. Winding through rural areas and conservation land, the river is considered one of the cleanest rivers in the nation. This wild and natural river draws attention from scientists studying the insect life on its unusual shifting sandy bottom.
The Everglades is the world's slowest-moving river. When rain fills Lake Okeechobee, in south-central Florida, the lake overflows into the 50-foot wide, 1.5 million acre water filtration system and flows about one meter an hour toward the Gulf of Mexico, at the southern tip of the Sunshine State.