Grassland biomes are large, rolling terrains of grasses, flowers and herbs. Latitude, soil and local climates for the most part determine what kinds of plants grow in a particular grassland. A grassland is a region where the average annual precipitation is great enough to support grasses, and in some areas a few trees.
The largest (nonpolar) desert in the world is the Sahara, in north Africa, which spans an area measured at roughly 3.5 million square miles. The United States' contiguous 48 states could easily fit in the desert. It spans more than 3,000 miles across Africa, stretching from the Atlantic Ocean to the Red Sea.