1:1,000,000-scale Hydrographic Areas of the Great Basin

This data set consists of hydrographic area and major flow system boundaries and polygons delineated at 1:1,000,000-scale for the Great Basin.本数据集涵盖大盆地（Great Basin）区域内按1:100万比例尺绘制定界的水文区域、主要水系边界与多边形。