The aim of landscape ecosystem classification and mapping is to distinguish appropriately sized ecosystems-useful and functional land units that differ significantly from one another in abiotic characteristics as well as in their related biotic components. The subdivision of a large area into distinctive landscape ecosystems provides a framework for integrated resource managemnet and planning; for biological conservation; and for comparison of differences in composition, occurrence, interactions, and productivity of plants and animals among ecosystems. Based on differences in climate, bedrock geology, glacial landforms, and soils, this classification delineates and describes the map units at the Section, Subsection, and Sub-subsection levels that represent areas with distinctive natural conditions affecting species composition and productivity. Macroclimates and physiography were the major components used to distinguish sections and subsections; differences in local physiography and soil were used primarily to delineate sub-subsections. Vegetation was used wherever possible to validate climatic and geomorphological boundaries.A link to theGeneral Technical Reportcan be found online.