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)
Allegheny Mountain (Pennsylvania) For the Little Allegheny Mountain summit (2,165 feet) in Maryland, see Dans Mountain. For other mountains with a similar name, see Allegheny Mountain (disambiguation). Allegheny Mountain Tunnel on the Pennsylvania Turnpike. Allegheny Mountain.