Saint Johns River depth map (nautical chart)The marine chart shows water depth and hydrology on an interactive map. The source of the Saint Johns River is St. Johns Marsh near Vero Beach. The mouth of is the Atlantic Ocean near Jacksonville, Duval County. Average discharge: 15,000 cu ft/s (420 m3/s).
310 mi (500 km)
8,840 sq mi (22,900 km2)
Jacksonville, Sanford, Deltona, DeLand, Palatka, DeBary, Green Cove Springs, Orange Park