A picture is a small river. This river is very clear. How clear is it?

One of the photos is a small river, the river is very clear, and it is crystal clear against the blue sky and white clouds. A river is crystal clear. Hummingbird Photography Forum provides exquisite photos and pictures, provides works appreciation for photographers, and facilitates users to learn photography skills and post-processing skills, understand photographic equipment and share exquisite photos.