How long does a river have to be to be called a river?

There is no "minimum length" to be classified as a river. However, width, and to a lesser extent depth do figure into whether or not it is called a river. If one can toss a rock across it, and it is uniformly shallow, it is usually called a creek.

If it's wide and deep enough for easy ship handling, it's a river, regardless of length.

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