wagga wagga (; informally called wagga) is a major regional city in the riverina region of new south wales, australia. straddling the murrumbidgee river, with an urban population of more than 56,000 as at june 2018, wagga wagga is the state's largest inland city, and is an important agricultural, military, and transport hub of australia. the ninth fastest growing inland city in australia, wagga wagga is located midway between the two largest cities in australia–sydney and melbourne–and is the major regional centre for the riverina and south west slopes regions.