Plains are large stretches of flat land. They are, generally, not more than 200 metres above the sea level. Most of plains are formed by rivers and their tributaries. The rivers flow down the slopes of mountains and erode them. They carry forward the eroded material. Then they deposit their load consisting of stones, sand and silt along their courses and in their valleys. It is from these deposits that the plains are formed.

Additional information: Some plains are extremely level while, others may be slightly rolling and undulating.