Free images results:

Wetlands pictures, stock photos and images


Boardwalk Royalty Free Stock Photography
Author: Webking
The duck Stock Photo
Author: Dengess

Also, here are some commercial RF-licensed images that match your search criteria:  
Wetlands Royalty Free Stock Photos
Author: Nito100
Wetlands Stock Images
Author: Wlq5231

Explore more commercial options: More Wetlands Stock Illustrations & Vectors | More Wetlands Stock Video Footage