rapids
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.
A ditch is a narrow water channel. It begins with the letter d.
river
no heckin clue
Kelt
no heckin clue
straight, strait
Canyon
a channel
This is a strait
The homophone for direct, not crooked, narrow, natural channel of water is "strait."
Kyle means "narrow, straight".