Marina debris is the trash and other yucky things that end up floating in the water around docks where boats are kept. When people use their boats and hang out at the marina, they may accidentally drop things like plastic bottles, food wrappers, and fishing gear into the water. These things can harm the animals and plants living in the water, and they just look pretty gross too!
Sometimes, the marina debris is also caused by things like storms or big waves, which can wash trash into the water. It's very important for people to clean up after themselves and prevent debris from ending up in the water. This way, the water can stay clean and healthy for all of the living things that call it home.