Such as the Chattooga, the Nantahala, and the Whasitcalhuh.

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Count the 7 hill ranges – the last one is faint, on the horizon.
We swam in several rivers, camped, hiked along ridgelines and alongside the whitewater.
Snorkeled in the billibongs. Strong current! Strong current!
How To:
Get underwater. Find large anchored stones and hook your arm to keep from moving downstream faster than you know is safe.
I surfed several slick rocks while under 4 feet of water by planting my feet, leaning upstream and letting it scoot me along.
Surfed that mountain!
A good ride was had by all.