Lateral mark

Imagine you are in a big swimming pool and there are several floating things in the water that tell you where to go. These floating things are like lateral marks in the ocean or a river. They are used by boats to help them stay on course and avoid running into anything dangerous.

Lateral marks help boats navigate and keep them from getting lost or stuck. They come in different shapes and colors, but they all mean the same thing. For example, a red mark means that you should keep it on your right side when traveling upstream, and a green mark means you should keep it on your left side.

So when you see these floating things in the water, remember the colors and which side to keep them on. That way you'll avoid bumping into anything and stay safe on your journey.