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- Photography 9
- Tunnels 8
- Northwest, Pacific 7
- Rivers 6
- Scenic byways 6
- Cliffs 5
- Formations (Geology) 5
- Rocks 5
- Canyons 4
- Gorges 4
- Nature 4
- Railroad tracks 4
- Rivers--Oregon 4
- Bodies of water 3
- Columbia River Highway (Or.) 3
- Mountains 3
- Trees 3
- Waterfalls 3
- Basalt 2
- Bridges 2
