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Manteca/Merced Alluvium

Ecoregion in Central Valley, CA

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The Manteca/Merced Alluvium ecoregion is on very gently to gently sloping floodplains and alluvial fans that slope from the higher terraces and foothills in regions to the east toward the San Joaquin River to the west. The soil temperature regime is thermic and soil moisture regimes are xeric and aquic. Natural vegetation historically included perennial and annual grasslands, valley oak savannas, cottonwoods, and willow. Cropland, pasture, and urban uses now dominate.

— EPA

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