NASA Earth Observatory on Nov. 2 published Landsat 8 images of Pine Creek Gorge in north-central Pennsylvania, showing autumn color along the valley nicknamed the Grand Canyon of Pennsylvania¹.

The agency said the Operational Land Imager on Landsat 8, a NASA-USGS satellite, captured the gorge on Oct. 25, 2026, with a greener comparison scene from Oct. 9¹. It described the gorge as about 1,500 feet (460 meters) deep along a roughly 45-mile (72-kilometer) path from Ansonia south to Pine Creek’s confluence with the West Branch Susquehanna River, deepest around Waterville¹.

Unlike desert canyons with steep rock walls, NASA said vegetated slopes of the Allegheny Plateau outline the topography, with northern hardwood and mixed oak forest, plus hemlock and white pine, turning red and gold in fall¹.

The Earth Observatory said ice did not carve the canyon: Pine Creek once flowed north until glaciers dammed it, lakes overflowed south, and after the ice receded, glacial debris kept the stream from turning north while meltwater deepened the valley¹.

NASA said 19th-century logging of large white pine, hemlock and hardwoods, including log drives down Pine Creek, left the land so barren by the early 20th century that the area was called the Pennsylvania Desert¹. It said the forest has returned, with wildlife including black bears, coyotes, bobcats, timber rattlesnakes and songbirds, and that 30,000 acres (12,000 hectares) were designated a National Natural Landmark in 1968¹.

Images were credited to Michala Garrison using Landsat data from the U.S. Geological Survey; the story was by Lindsey Doermann¹.

Sources

1. NASAPennsylvania’s Grand Canyon12:01 AM

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