The One Minute Geographer: The Great Plains — High Plains and Low Plains

The Great Plains in blue with the 100-degree longitude line. Map from Wikipedia; line drawn by the author.

More about the 100-degree meridian. It runs through the heart of the Great Plains as you can see above. Definitions of the boundaries of the Great Plains vary and not all include Iowa and the sections of Minnesota and Missouri shown on this map.

The Magical Meridian also tends to lie near a break in elevation on the Plains. Very generally…