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8 entries
Hurricane Alley
The warm-water path of Atlantic hurricanes
The 100th Meridian
The historic line between the humid East and arid West
The Continental Divide
The Great Divide of the Rocky Mountains
The Eastern Continental Divide
The Appalachian line between Atlantic and Gulf waters
The Fall Line
Where the Piedmont drops to the coastal plain
Tornado Alley
The most tornado-prone region on Earth
U.S. Time Zones
The four clocks of the contiguous country
Watersheds & River Basins
How the country drains to the sea