Region
Pennsylvania
United States
15
Philadelphia
13
Chester County
7
Bucks County
6
Gettysburg National Military Park (Pa.)
5
Pittsburgh
5
Delaware
3
Indiana County
3
Montgomery County
3
White Clay Creek (Pa. and Del.)
3
Allegheny National Forest
2
Allegheny National Wild and Scenic River (Pa.)
2
Cambria County
2
Ebensburg Region
2
Independence National Historical Park (Philadelphia, Pa.)
2
Northampton County
2
Pittsburgh Region
2
Tioga County
2
Allegheny National Wild and Scenic River
1
Allegheny National Wild and Scenic River Region
1
Allentown Region
1
Armstrong County
1
Berks County
1
Blair County
1
Bridgeton (Township)
1
Carbondale
1
Clarion County
1
Conestoga River Watershed
1
Cowanesque River (Pa. and N.Y.)
1
Danville
1
Delaware River (N.Y.-Del. and N.J.)
1
Gettysburg National Military Park
1
Greene County
1
Harrisburg Region
1
Kentucky
1
Lansdale
1
Lansdale Region
1
Lehigh County
1
Little Scrubgrass Creek Watershed
1
Marcellus Shale
1
Maryland
1
Masontown Region
1
Mississippi River Valley
1
Monongahela River (W. Va. and Pa.)
1
New Cumberland Region
1
New Hope Region
1
New York (State)
1
Ohio
1
Ohio River Valley
1
more ...