Because of its location in the central highlands and its protection from geological fluctuations in sea level, the Ocklawaha River is one of the oldest rivers in Florida.
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The Finke River, which is also called Larapinta by the Aboriginal People, in central Australia is believed to be the oldest river in the world. While the Finke River's exact age is unknown, it is at least over 300 million years old and some of the oldest parts of the river may be over 340 million years old.
On average, the Rainbow River is less than 10 feet deep, although there are places where it drops 25 feet. Close to the banks, it's shallow enough to stand. Look out for big branches to jump from and a rope swing or two.
Johns River, Florida. At 310 miles [499 kilometers] long, the St. Johns River is the longest river in Florida, and the longest river in the United States that flows northward.