Geography and Ecology
Starting in Indian River County and meeting the Atlantic Ocean at Duval County, the St. Johns is Florida's primary commercial and recreational waterway. It flows north from its headwaters from the direction of the Lake Wales Ridge, which is only slightly elevated at 30 feet (9.1 m) above sea level. Because of this low elevation drop, the river has a long backwater. It ebbs and flows with tides that pass through the barrier islands and up the channel. Uniquely, it shares the same regional terrain as the parallel Kissimmee River, although the Kissimmee flows south.
Read more about this topic: St. Johns River
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