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- Formations (Geology) 19
- Northwest, Pacific 19
- Photography 19
- Bodies of water 15
- Rivers 15
- Riparian areas 9
- Mountains 5
- Postcards 4
- Waterfalls 4
- Bridges 3
- Railroads 3
- Floods 2
- Forests and forestry 2
- Indians of North America--Funeral customs and rites 2
- Nature 2
- Scenic byways 2
- Travel 2
- Tunnels 2
- Gorges 1
- Roads--Design and construction 1
