California Level 4 Ecoregions Map
| er13aa - Sierra Nevada-Influenced Semiaried Hills and Basins |
| er13ab - Sierra Valley |
| er13ac - Upper Owens Valley |
| er13ad - Mono-Adobe Valleys |
| er13ae - Bishop Volcanic Tableland |
| er13h - Lahontan and Tonopah Playas |
| er13j - Lahontan Salt Shrub Basin |
| er13u - Tonopah Basin |
| er13v - Tonopah Sagebrush Foothills |
| er13w - Tonopah Uplands |
| er13x - Sierra Nevada-Influenced Ranges |
| er13y - Sierra Nevada-Influenced High Elevation Mountains |
| er14a - Eastern Mojave Basins |
| er14b - Arid Footslopes |
| er14c - Mojave Mountain Woodland and Shrubland |
| er14e - Arid Valleys and Canyonlands |
| er14f - Mojave Playas |
| er14g - Amargosa Desert |
| er14h - Death Valley/Mojave Central Trough |
| er14i - Mesquite Flat/Badwater Basin | er14i - Western Mojave Basins |
| er14k - Western Mojave Low Ranges and Arid Footslopes | er14k - Western Mojave Mountain Woodland and Shrubland |
| er14m - Western Mojave High Elevation Mountains | er14m - Mojave Lava Fields |
| er14o - Mojave Sand Dunes | er14o - Coastal Lowlands |
| er1h - Southern Oregon Coastal Mountains | er1h - Redwood Zone |
| er1j - King Range/Mattole Basin | er1j - Coastal Franciscan Redwood Forest |
| er1l - Fort Bragg/Fort Ross Terraces | er1l - Point Reyes/Farallon Islands |
| er1n - Santa Cruz Mountains | er1n - San Mateo Coastal Hills |
| er4d - Cascade Subalpine/Alpine | er4d - High Southern Cascades Montane Forest |
| er4f - Low Southern Cascades Mixed Conifer Forest | er4f - California Cascades Eastside Conifer Forest |
| er4h - Southern Cascades Foothills | er4h - Mid-Elevation Sierra Nevada |
| er5b - High Elevation Sierra Nevada | er5b - Northern Sierra Upper Montane Forests |
| er5d - Northern Sierra Mid-Montane Forests | er5d - Northern Sierra Lower Montane Forests |
| er5f - Northeastern Sierra Mixed Conifer-Pine Forests | er5f - Central Sierra Mid-Montane Forests |
| er5h - Central Sierra Lower Montane Forests | er5h - Eastern Sierra Great Basin Slopes |
| er5j - Eastern Sierra Mojavean Slopes | er5j - Southern Sierra Subalpine Forests |
| er5l - Southern Sierra Upper Montane Forests | er5l - Southern Sierra Mid-Montane Forests |
| er5n - Southern Sierra Lower Montane Forest and Woodland | er5n - Tehachapi Mountains |
| er6a - Tuscan Flows | er6a - Eastern Hills |
| er6ab - Pleasant Valley/Kettleman Plain | er6ab - Temblor Range/Elk Hills |
| er6ad - Grapevine Transition | er6ad - Tehachapi Foothills |
| er6af - Salinas Valley | er6af - Northern Santa Lucia Range |
| er6ah - Santa Lucia Coastal Forest and Woodland | er6ah - Interior Santa Lucia Range |
| er6aj - Southern Santa Lucia Range | er6aj - Paso Robles Hills and Valleys |
| er6al - Salinas-Cholame Hills | er6al - Cuyama Valley |
| er6an - Carrizo Plain | er6an - Caliente Range |
| er6ap - Solomon-Purisima-Santa Ynez Hills | er6ap - Santa Maria/Santa Ynez Valleys |
| er6ar - Upper Sacramento River Alluvium | er6ar - Northern Sierran Foothills |
| er6c - Southern Sierran Foothills | er6c - Camanche Terraces |
| er6e - Tehama Terraces | er6e - Foothill Ridges and Valleys |
| er6g - North Coast Range Eastern Slopes | er6g - Western Valley Foothills/Dunnigan Hills |
| er6i - Clear Lake Hills and Valleys | er6i - Mayacmas Mountains |
| er6k - Napa-Sonoma-Lake Volcanic Highlands | er6k - Napa-Sonoma-Russian River Valleys |
| er6m - Sonoma-Mendocino Mixed Forest | er6m - Bodega Coastal Hills |
| er6o - Marin Hills | er6o - Bay Flats |
| er6q - Suisun Terraces and Low Hills | er6q - East Bay Hills/Western Diablo Range |
| er6s - San Francisco Peninsula | er6s - Bay Terraces/Lower Santa Clara Valley |
| er6u - Livermore Hills and Valleys | er6u - Upper Santa Clara Valley |
| er6w - Monterey Bay Plains and Terraces | er6w - Leeward Hills/Western Diablo Range |
| er6y - Gabilan Range | er6y - Diablo Range |
| er78a - Rogue/Illinois/Scott Valleys | er78a - Serpentine Siskiyous |
| er78e - Inland Siskiyous | er78e - Klamath River Ridges |
| er78h - Border High-Siskiyous | er78h - Western Klamath Low Elevation Forests |
| er78j - Western Klamath Montane Forests | er78j - Eastern Klamath Low Elevation Forests |
| er78l - Eastern Klamath Montane Forests | er78l - Marble/Salmon Mountains-Trinity Alps |
| er78n - Scott Mountains | er78n - Klamath Subalpine |
| er78p - Duzel Rock | er78p - Outer North Coast Ranges |
| er78r - High North Coast Ranges | er78r - Northern Terraces |
| er7b - North Valley Alluvium | er7b - Butte Sink/Sutter and Colusa Basins |
| er7d - Southern Hardpan Terraces | er7d - Sacramento/Feather Riverine Alluvium |
| er7f - Sutter Buttes | er7f - Yolo Alluvial Fans |
| er7h - Yolo/American Basin | er7h - Delta |
| er7k - Lodi Alluvium | er7k - Stockton Basin |
| er7m - San Joaquin Basin | er7m - Manteca/Merced Alluvium |
| er7o - Westside Alluvial Fans and Terraces | er7o - Granitic Alluvial Fans and Terraces |
| er7q - Panoche and Cantua Fans and Basins | er7q - Tulare Basin/Fresno Slough |
| er7s - Kern Terraces | er7s - South Valley Alluvium |
| er7u - Antelope Plain | er7u - Southern Clayey Basins |
| er80d - Pluvial Lake Basins | er80d - High Lava Plains |
| er80j - Semiarid Uplands | er80j - Western Sonoran Mountains |
| er81b - Western Sonoran Mountain Woodland and Shrubland | er81b - Western Sonoran Basins |
| er81d - Sand Hills/Sand Dunes | er81d - Upper Coachella Valley and Hills |
| er81f - Imperial/Lower Coachella Valleys | er81f - Lower Colorado/Lower Gila River Valleys |
| er81h - Sonoran Playas | er81h - Central Sonoran/Colorado Desert Mountains |
| er81j - Central Sonoran/Colorado Desert Basins | er81j - Arizona Upland/Eastern Sonoran Mountains |
| er85a - Santa Barbara Coastal Plain and Terraces | er85a - Oxnard Plain and Valleys |
| er85c - Venturan-Angeleno Coastal Hills | er85c - Los Angeles Plain |
| er85e - Diegan Coastal Terraces | er85e - Diegan Coastal Hills and Valleys |
| er85g - Diegan Western Granitic Foothills | er85g - Morena/Boundary Mountain Chaparral |
| er85i - Northern Channel Islands | er85i - Southern Channel Islands |
| er85k - Inland Valleys | er85k - Inland Hills |
| er85m - Santa Ana Mountains | er85m - Western Transverse Range Lower Montane Shrub and Woodland |
| er8b - Western Transverse Range Montane Forest | er8b - Arid Montane Slopes |
| er8d - Southern California Subalpine/Alpine | er8d - Southern California Lower Montane Shrub and Woodland |
| er8f - Southern California Montane Conifer Forest | er8f - Northern Transverse Range |
| er9g - Klamath/Goose Lake Basins | er9g - Fremont Pine/Fir Forest |
| er9i - Southern Cascade Slope | er9i - Klamath Juniper Woodland |
| er9k - Shasta Valley | er9k - Pit River Valleys |
| er9m - Warner Mountains | er9m - High Elevation Warner Mountains |
| er9o - Likely Tableland | er9o - Modoc/Lassen Juniper-Shrub Hills and Mountains |
| er9q - Adin/Horsehead Mountains Forest and Woodland | er9q - Adin/Dixie Low Hills |
| er9s - Modoc Lava Flows and Buttes | er9s - Old Cascades |
Based on Ecoregions developed by the EPA this map describe areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources, as well as similarity of climate that can assist California gardenders.
