Geography of the United States
In fact, the only high land in the East of the U.S. is where there is a very ancient ground-down mountain range known as as the Allegheny Mountains. What is now the Alleghenys was once part of the great Appalachian orogeny (mountain building) about 300 million years ago. What remains now is just the ground-down roots of this ancient mountain chain. In the top-most physical map the red-brown areas are high land.