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- Northwest, Pacific 84
- Photography 76
- Rivers 62
- Bodies of water 36
- Riparian areas 23
- Mountains 22
- Highway engineering 20
- Scenic byways 18
- River engineering 13
- Jetties 11
- Formations (Geology) 10
- Nature 10
- Postcards 10
- Travel 10
- Steamboats 8
- Bridges 7
- Locks (Hydraulic engineering) 6
- Railroads 6
- Tunnels 5
- Waterfalls 5