Imperial Valley, a fertile irrigated farming valley in southeastern California and the northeastern corner of the Mexican state of Baja California. The Imperial Valley, covering about 4,400 square miles (11,400 km2), is mostly below sea level. Temperatures often exceed 100° F. (38° C.) on summer days. Rainfall is less than 4 inches (100 mm) a year.
The valley is one of California's leading truck-farming areas, producing a large variety of fruits and vegetables. The valley is irrigated with water diverted from the Colorado River through the All-American Canal. Water from the Colorado River was first brought to the Imperial Valley in 1902. During 1905–07, floodwaters filled a depression in the area, creating the Salton Sea. .)