水道，是一种大型水体的称呼，与海峡相类似。其特征为两边(或多边)各自连通的水体。江河湖泊入海口之前就常有水道。

比较著名的水道有:

• 龙鼓水道
• 西北水道
• 鲤鱼门

In physical geography, a channel is a type of landform consisting of the outline of a path of relatively shallow and narrow body of fluid, most commonly the confine of a river, river delta or strait. The word is cognate to canal, and sometimes shows in this form, e.g. the Hood Canal. Most examples of this are fjords in the Pacific Northwest; a notable exception is the Casiquiare canal. All likely share borrowing from Spanish, Portuguese or French.