Level III Ecoregions of North Dakota

Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and...按州划分的生态区（Ecoregions）已从无缝全国Shapefile中提取。生态区指在生态系统、生态类型、质量及……方面具有普遍相似性的区域。