| 11. | The steep inclines of the valley walls were softened, and more rail lines were put in.
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| 12. | The lower Clearwater in Alberta is characterized by high valley walls of limestone and dolomite gorges.
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| 13. | More recent development has seen housing on steeper parts of the Diamond Head side valley wall.
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| 14. | The caves lie on the steep valley walls near the Kali Gandaki River in Upper Mustang.
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| 15. | The route decided upon called for two tunnels driven in three-quarter circles into the valley walls.
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| 16. | The climb up to the higher ground is very steep, making the valley walls virtually uninhabitable.
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| 17. | An attempt to locate a bike trail along the valley walls has encountered fierce resistance from farmers.
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| 18. | The valley walls are steep in places and house sites are correspondingly uneven, in typical Wellington fashion.
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| 19. | Fredonia Mountain, a section of the western valley wall, rises steeply a few miles west of Dunlap.
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| 20. | Some of the rocks that tumbled down the sheer valley walls were almost as big as cars.
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