Report Executive Summary: A quantitative and spatial analysis of the agricultural land and water resources of the San Joaquin Valley using the Data Basin platform shows that high quality farmland is more limited than casual observation suggests and that stress on irrigation water supplies is extensive, but varies widely throughout the region. The best farmland, especially that with more reliable water, is located mainly around cities where it is most at risk of development for non-farm uses. Water supplies are likely to experience further stress and, indeed, decline due to pending regulatory actions and climate change, likely reducing the amount of land under cultivation. Land use policy decisions will also influence how much farmland is available in the future, potentially having an impact comparable to what happens with water. A comprehensive, systematic effort to manage the region’s land and water resources should be undertaken with the goal of optimizing the resilience and sustainability of its world-class agriculture land.