Whitewater (noun)

Fast-moving, turbulent water in a river or stream, often characterized by white foam.

Origin:

20th century: from white + water.

Examples:

1. The kayakers were experienced in navigating the rapids and whitewater of the river.
2. The rafting trip took us through some challenging whitewater.
3. The whitewater was caused by the rocks and boulders in the riverbed.
4. The whitewater made the river dangerous for swimming or boating.
5. The whitewater was a popular destination for rafting and kayaking enthusiasts.