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- Northwest, Pacific 7
- Photography 7
- Scenic byways 4
- Tunnels 4
- Bodies of water 3
- Formations (Geology) 3
- Rivers 3
- Bridges 2
- Highway engineering 2
- History 2
- Nature 2
- Travel 2
- Waterfalls 2
- Gorges 1
- Mountains 1
- Riparian areas 1
- Roads--Design and construction 1
