An Ecoregion is a part of a province characterized by distinctive regional ecological factors, including climatic, physiography, vegetation, soil, water, fauna, and land use. An Ecozone is an area of the earth's surface representative of large and very generalized ecological units characterized by interactive and adjusting abiotic and biotic factors. The Saskatchewan Enduring Features are a founding piece to the Representative Areas Network (RAN) and it's goal to identify areas representative of native ecological diversity. The enduring features approach is based on the premise that areas characterized by specific rock, soil and landform patterns are very stable over long periods of time and are likely to be occupied by characteristic plant and animal communities. Application of this coarse filter approach to the selection of areas requires that the characteristics used in defining enduring features be indicative of the composition and diversity of biological communities across landscapes. The Enduring Features dataset is based on the Soil Landscapes of Canada (SLC) version 2.1. Four SLC attributes that are ecologically representative were chosen and became known as an Enduring Feature Attribute (EFA). The four attributes are Soil Development (D), Origion of Parent Material (P), Surface Form (L) and Slope (S). These EFA's were then systematically combined to create an identifier for each ecoregion landscape area, known as an Enduring Feature Attribute Group (EFAG). In the table, the EFAG field has a name of D_P_L_S_ for the cencatonation of the four attribute codes. One of the fields also combines the ecoregion code as well. RAN gap analysis use this dataset.