godan verb (-ru), intransitive verb
be perfectly clear; be cloudless; be serene
Describes the sky, weather, or water being completely clear and unobstructed. Often used for a crisp, cloudless sky or crystal-clear water.
秋の空は澄み渡っている。
The autumn sky is perfectly clear.
湖の水が澄み渡って、底まで見える。
The lake water is so clear that you can see the bottom.