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- Waterfalls 91
- Rapids 33
- Photography 24
- Rivers 24
- Northwest, Pacific 20
- Celilo Falls (Wash.) 17
- Columbia River 17
- Oregon, Eastern 14
- Bodies of water 12
- Indians of North America 12
- Bridges 11
- Footbridges 11
- Landscape photography 10
- Nature photography 10
- Columbia River Watershed 8
- Scenic byways 7
- Forests and forestry 6
- John Day River (Or.) 6
- Mountains 6
- Fishing 5