This report presents and describes high-resolution geo-spatial data identifying the range of environmental conditions that influence the location of cropped agricultural lands in the conterminous United States. Also presented are estimates of the extent of land where environmental constraints limit agricultural production (marginal land) and the extents of land where modifications overcome environmental constraints. The report is the result of the compilation and manipulation of datasets from numerous sources; it consists of an explana-tory text and a series of appendixes and associated tables that document the data sources and data-manipulation methods in detail.