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- Photography 297
- Rivers 200
- Northwest, Pacific 155
- Bodies of water 132
- Explorers 75
- Riparian areas 64
- Mountains 55
- Discovery and exploration 48
- Canada, Western 33
- Scenic byways 33
- West (U.S.) 27
- Formations (Geology) 26
- Tourism 25
- Waterfalls 24
- Rapids 22
- Boats and boating 21
- Railroads 21
- Steamboats 19
- Highway engineering 18
- Bridges 17
