A grassland is an ecosystem that's thickly covered in short plants. Grasslands are notable for being lush and green.
An area of land that mostly grows grass is a grassland — although there are other plants typically mixed in among the grasses, like clover, flowers, and woody plants. In the U.S., tallgrass prairies once covered huge portions of the midwestern states and were an example of one type of grassland. Today, these ecosystems can still be found around the world in regions that receive significant rainfall.