Citrus fruits, the chief crop grown, are planted in beds between shallow ditches that are part of the water-control system. Vegetation on the rangeland consists of native grasses, forbs, sedges, and a few scattered pines. The very broad and nearly level lowlands are mantled by sand over loamy materials and in a few places over limestone. Most of the area is almost flat, but some hummocks rise a meter or two above the general level. Average annual precipitation -1,325 to 1,525 mm.
Maximum precipitation is in summer, and the minimum is late in autumn and in winter.
Rainfall, surface water, and ground water provide an abundance of water. Unless practices are used to control the water level in naturally wet areas, shallow water covers the surface during much of the rainy season. Canals and ditches control the groundwater level for crops and pasture. Excess water is pumped out during the rainy season, and irrigation water is applied during the growing season. Domestic and irrigation water supplies are obtained mainly from wells in the underlying limestone.