What is the area that stretches across central north america?

The Great Plains stretch across the entire part of central North America. This region is about five hundred miles long, from east to west, and about two thousand miles wide, from north to south. It covers an area of roughly 808 thousand square miles. The Great Plain's topography is mainly flat land. It is covered by different types of grassland. The Rocky mountain range lies to the west of the Great Plains. It covers parts of Kansas, Montana, New Mexico, Oklahoma, North and South Dakota in the USA, as well as, Alberta, Saskatchewan and Manitoba in Canada. 

1.0 larger it be exact