La Rioja (Spanish pronunciation: [la ˈrjoxa]) is one of the provinces of Argentina and is located in the west of the country. Neighboring provinces are from the north clockwise Catamarca, Córdoba, San Luis and San Juan.
The Argentine Northwest (Noroeste Argentino) is a region of Argentina composed by the provinces of Catamarca, Jujuy, Salta, Santiago del Estero and Tucumán.