Level IV Ecoregions of Washington

Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and...各州的生态区数据提取自无缝衔接的全国形状文件（shapefile）。生态区指的是生态系统、生态类型与质量等方面具备总体相似性的区域。