Colorado River: In the July 19 Section A, a map with an article about the shrinking Colorado River showed the National Oceanic and Atmospheric Administration's Colorado River Basin forecast area, not the hydrologic region. Also, the Gulf of California was mislabeled as the Gulf of Mexico. The corrected map is above.
Arizona water: In the July 19 Section A, a photo caption accompanying an article about dwindling water supplies in Arizona said that the water behind Imperial Dam is diverted in part to New Mexico. Imperial Dam is in the Colorado River's Lower Basin; New Mexico's water allocation is from the Upper Basin.