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Napa-Sonoma-Russian River Valleys

Ecoregion in Coast Ranges, CA

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The Napa-Sonoma-Russian River Valleys ecoregion is lower, flatter, more populated, and has more cropland, vineyards, and orchards than the surrounding more mountainous ecoregions (6j, 6k, and 6m). The Ukiah/Russian River valley in the north has less marine influence and fog than the valleys to the south. Quaternary alluvium covers large parts of the region, along with some other areas of older, loosely consolidated sedimentary material. The southern valleys of the North Coast Range include the Napa, Sonoma, Petaluma, and Cotati Valleys, and the Santa Rosa Plain. Elevations range from about 20 feet near the river deltas and bay flats of Ecoregion 6p to more than 500 feet in the northern hilly margins. Grape vineyards are extensive, as well as some areas of orchards or specialty crops. The southern low elevation parts of the valleys have more marine influence and fog than the high elevation northern parts, affecting grape varietals and production.

— EPA

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