干谷(阿拉伯语:وادي,罗马化:wādī),或称旱谷、干河床,在翻译地名时一般作干河[1][注 1],指北非和阿拉伯沙漠地区干涸的沙砾河床,地下水的水平不在地面,时有水时无水,时为商旅的交通道路。在岩溶地貌中,地表河谷流水注入落水洞,即转入地下,原河谷下游段或衰变成为无水流动的干谷。
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