The large, bright white and grey checked area in this orthorectified image is a mostly agricultural zone in the Mexican state of Sonora. The intensely irrigated, expansive area of fields is bordered by the Gulf of California (or Sea of Cortez) below and the city of Ciudad Obregón above.
Ciudad Obregón (locally known simply as Obregón) is the second largest city in the northern Mexican state of Sonora and is situated 525 km (326 mi) south of the state’s border with the U.S. state of Arizona. It is also the municipal seat of Cajeme municipality, located in the Yaqui Valle.
Source: Earth Snapshot, www.eosnap.com