Level III Ecoregions of Pennslyvania

Revised March 1999
National Health and Environmental Effects Research Laboratory
U.S. Environmental Protection Agency

58. Northeastern Highlands    60. Northern Appalachian Plateau and Uplands    61. Erie Drift Plains    62. North Central Appalachians    67. Ridge and Valley    69. Central Appalachians    70. Western Allegheny Plateau    83. Eastern Great Lakes and Hudson Lowlands