The One Minute Geographer: The Great Plains — the 20 inch Rainfall Line
2 min readOct 12, 2021
The 100th Meridian (yellow on the map), is a fascinating line because it happens to closely coincide with other important geographical features of the Great Plains.
Today we’ll take a quick look at the 20-inch rainfall line in red, above. I drew it to roughly correspond with the 20-inch line on the map of annual precipitation below.