Microplastics are found nearly everywhere on Earth and can be harmful to animals if they're ingested. But it's hard to remove such tiny particles from the environment, especially once they settle into nooks and crannies at the bottom of waterways.
Nearly all areas of the planet have microplastics, which are dangerous to animals if consumed. But once they find their way into the cracks at the bottom of rivers, it is difficult to get rid of such tiny particles from the ecosystem.