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- Columbia River Valley 23
- Columbia River 19
- Rivers 15
- Trees 14
- Nature 11
- Rocks 6
- Landforms 5
- Landscapes 5
- Riparian areas 4
- Cliffs 3
- Columbia River Highway (Or.) 3
- Mountains 3
- Cascades (Or. and Wash.) 2
- Multnomah Falls (Or.) 2
- Persons 2
- Railroad tracks 2
- Rapids 2
- Waterfalls 2
- Automobiles 1
- Boats 1