 The high soil fertility and abundance of water in the Riverina floodplain has made the Riverina region one of the most productive farming regions in Australia with rice , wheat , maize , canola , citrus and wine grapes being grown in the area . The Riverina contains many irrigation schemes including the Murrumbidgee Irrigation Area . 182 @,@ 000 hectares ( 450 @,@ 000 acres ) are under irrigation in the region . 
