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乾谷(阿拉伯語:وادي,羅馬化:wādī),或稱旱谷、乾河床,在翻譯地名時一般作乾河[1][註 1],指北非和阿拉伯沙漠地區乾涸的沙礫河床,地下水的水平不在地面,時有水時無水,時為商旅的交通道路。在岩溶地貌中,地表河谷流水注入落水洞,即轉入地下,原河谷下游段或衰變成為無水流動的乾谷。
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