Member Login. The following was included in TCTA's 2015-16 Survival Guide, the ultimate reference tool for Texas educators, and is current as of September 2015 but is subject to change.
The Allegheny Mountains run diagonally from the southwest to the northeast with piedmont and coastal plains in the southeast triangle. The Allegheny Front, as it's called, cuts a diagonal line across the state. In the northwest, the plateau falls to the Lake Erie lowlands and, finally, Lake Erie. ( Pennsylvania Close-up)
The Blue Ridge Mountains. Blue Ridge, also called Blue Ridge Mountains, segment of the Appalachian Mountains in the United States, extending southwestward for 615 mi (990 km) from Carlisle, Pa., through parts of Maryland, Virginia, North Carolina, and South Carolina, to Mt. Oglethorpe, Georgia.