Free images results:
 

Rivers pictures, stock photos and images

 
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Waterwheel Stock Image
Author: Prawny
Dream weir Stock Photos
Author: Newman
Sun waves Stock Photo
Author: Lakisf
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Rivers Royalty Free Stock Photography
Author: Sleiselei
Rivers Royalty Free Stock Photography
Author: Sleiselei
Rivers Royalty Free Stock Photo
Author: Sleiselei
Rivers Royalty Free Stock Photo
Author: Sleiselei
Rivers Royalty Free Stock Photo
Author: Sleiselei