Monongahela River topographic map

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Keystone Lake (also known as Keystone Reservoir and Plum Creek Reservoir) is a reservoir in Armstrong County in the U.S. state of Pennsylvania. The elevation of Keystone Lake is 1,076 feet (328 m) above sea level.

Average elevation: 357 m

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Skytop is an unincorporated community in Barrett Township, Monroe County, Pennsylvania, United States. Located north of Mountainhome, it is accessible by local roads off Route 390. Its elevation is 1,562 feet (476 m), and it is located at 41°13′40″N 75°14′18″W / 41.22778°N 75.23833°W /…

Average elevation: 469 m

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The ridge of Blue Mountain runs for 150 miles (240 km) through Pennsylvania, reaching an elevation of 2,270 feet (690 m) above sea level just north of the Pennsylvania Turnpike, near the borough of Newburg. Most of the ridgecrest, however, only reaches between 1,400 and 1,700 feet (430 and 520 m) in elevation.…

Average elevation: 242 m

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