Full tutorial on How To Build A Glow River in your Minecraft Bedrock Edition, or MCPE, vanilla survival world. This is a caves and cliffs 1.17 update release build.

This will make any lake or body of water have a really cool fog effect. It will appear as a smokey under glow below the alternating glass blocks. I've seen other people call it a glass void effect as well.

Perfect for areas that are very dark at night.