Free images results:
 

Rapids pictures, stock photos and images

 
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Log stuck Stock Image
Author: Izanoza
Kayak Royalty Free Stock Photo
Author: Rodehi
Kayak Stock Images
Author: Rodehi
Kayak Royalty Free Stock Photography
Author: Rodehi
Kayak Stock Images
Author: Rodehi
Kayak Stock Photo
Author: Rodehi
Prickly! Stock Image
Author: Suydam
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Rapids Royalty Free Stock Photo
Author: Bjwynnyk
Rapids Royalty Free Stock Photo
Author: Petermccue