Level III Ecoregions of Tennessee

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）数据提取自无缝全国形状文件（shapefile）。生态区指在生态系统、生态类型与质量等方面具有总体相似性的区域。