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Riverina (rĬv´ərē´nə), region, 26,560 sq mi (68,790 sq km), New South Wales, SE Australia. Located S of the Lachlan River in the south central part of the state, Riverina is a rich agricultural area with associated processing industries. The Murrumbidgee River runs through the region, and much of the farming depends on irrigation. It has been inhabited by an aboriginal population since early times. Chief towns are Albury, Wagga Wagga, Leeton, and Griffith.