Wheat Belt

Từ điển Oxford Advanced Learner 8th

▪ I. the ˈWheat Belt 7 [Wheat Belt] BrE NAmE noun singular
the western central region of the US including the Great Plains where wheat is an important crop
 
▪ II. the Wheat Belt [the Wheat Belt] BrE NAmE
the western central region of the US, where most of the country’s wheat is grown. It includes the ↑Great Plains.