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- Rivers 6
- Bodies of water 5
- Northwest, Pacific 5
- Photography 5
- Riparian areas 5
- Steamboats 3
- Locks (Hydraulic engineering) 2
- Mountains 2
- Rapids 2
- Buildings 1
- Formations (Geology) 1
- Landscapes 1
- Storefronts 1
- Tugboats 1
- Willamette River (Or.) 1