rapids
A ditch is a narrow water channel. It begins with the letter d.
A creek is larger than a rill. A rill is a small, narrow channel typically seen on a hillside, while a creek is a larger flowing body of water.
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Kelt
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straight, strait
a channel
The homophone for direct, not crooked, narrow, natural channel of water is "strait."
Canyon
Kyle means "narrow, straight".
fjord
River