in an ecoregion system advanced by the world wildlife fund, british columbia's ecosystems are divided on five different levels, each classifying the area on a progressively more detailed basis. at the top level, ecodomains delineate areas of broad climatic uniformity across the world. the ecodomains are then divided into ecodivisions which delineate areas of broad climatic and physiographic uniformity. next, the ecodivisions are divided into ecoprovinces which consider climate, oceanography, relief and regional landforms. the ecoprovinces are then divided into ecoregions which consider major physiographic and minor macroclimatic or oceanographic variations. finally, the ecoregions are divided into ecosections for minor physiographic and macroclimatic or oceanographic variations. overall, b.c. is divided into 4 large ecodomain areas which are progressively divided down into 114 small ecosections.