• 渓谷けいこく — mountain gorge; ravine
• 雪渓せっけい — snowy valley; lingering snow in a ravine
• 渓流けいりゅう — mountain stream; fast-flowing river in a valley

With the water radical on the left and a phonetic element on the right, 渓 paints the picture of water flowing between steep sides. It came to mean a narrow valley or ravine with a clear mountain stream.