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- Formations (Geology) 23
- Landforms 8
- Rocks 8
- Beaches 3
- Cliffs 3
- Coasts 3
- Crater Lake National Park (Or.) 3
- Sand 3
- Caves 2
- Speleothems 2
- Crater Lake (Or.) 1
- Glaciers 1
- Lakes 1
- Landscapes 1
- Ocean 1
- Oregon Caves National Monument (Or.) 1
