China people often say "water ghost" refers to what?

Generally refers to aquatic plants in water. After entering the water, people are easily entangled in their legs by aquatic plants, leading to drowning.

Some refer to some unknown creatures in the water, such as messy monsters, which are really rare.

It is more an adult's idea to warn children not to go into the water.

Now the water pollution is serious, and the toxic chemicals in the water may also become new water ghosts!