River babble.

Meaning: This means the gentle, continuous sound of a river flowing. It's like saying, The river makes a soothing, murmuring sound as the water flows over rocks and pebbles.

Choice of Words: River is a large, flowing body of water that usually empties into a sea or an ocean. Babble is a continuous, friendly, and relaxed talking or murmuring sound often produced by water in motion. Together, "River babble" evokes the soothing sound of a flowing river.

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