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- Waterfalls 205
- Rivers--Oregon 37
- Rapids 33
- Rivers 27
- Photography 24
- Footbridges 22
- Northwest, Pacific 20
- Celilo Falls (Wash.) 17
- Columbia River 17
- Bridges 16
- Indians of North America 16
- Oregon, Eastern 14
- Fishing 13
- Bodies of water 12
- Landscape photography 10
- Nature photography 10
- Forests and forestry 9
- Columbia River Watershed 8
- Formations (Geology) 7
- Scenic byways 7
