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12号公路长122英里,西侧入口源于迪克西国家森林区的红峡谷(Red Canyons),经过布莱斯峡谷国家公园 ( Bryce Canyon National Park )后,再过Cannonville 小镇,和Escalante 镇后,再经分别可连接的棉花木峡谷道 (Cottowood canyon Rd )与洞石道 (Hole in the Rock Rd )这两条美景沙石土路,后,从小牛溪瀑布身边擦过,再向东北延伸至国会礁国家公园之24号公路结束.沿途美景不断,值得走一趟.
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峡谷下部,青绿一片,相信会有动物在此栖息.小牛溪正在下部穿越。
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这里是阳光背处.光线不足。
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在快接近国会礁公园前这一节路,会经过这片白桦树林.
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