The "Barassi Line" is an imaginary line in Australia which approximately divides areas where Australian rules football or rugby league is the most popular football code. It was first used by historian Ian Turner in his "1978 Ron Barassi Memorial Lecture". Crowd figures, media coverage, and participation rates are heavily skewed in favour of the dominant code on both sides.
Despite Australian culture's relatively homogeneous nature, a strong dichotomy exists in the country's football sporting culture. The divide has existed since Australian rules football and rugby union developed their identities as distinct codes, before rugby league overtook the latter as the dominant sport on the Eastern Seaboard. Australian rules football is the most popular football code to the west and south, including the capitals of Melbourne, Perth, Adelaide, Hobart, and Darwin while rugby league and rugby union are more popular on the eastern side, including the capitals of Sydney, Brisbane and Canberra. Each side represents roughly half of the Australian population due to the concentration of the population on the east coast. In many areas the other side's sport remains virtually unknown, lacking any meaningful media profile or awareness. The football culture is significantly ingrained such that it even has an influence on Australians' movement throughout the country. These "insurmountable cultural barriers" have created a significant challenge for each code's national development.
Roughly speaking, it follows Queensland's western border, drops southeast through western New South Wales, and ends at the Pacific Ocean at Cape Howe on the border of New South Wales and Victoria. It divides New South Wales, placing the Riverina area of southern New South Wales and the western mining city of Broken Hill on the Australian rules football side, and the rest on the rugby side. It runs through the Australian Capital Territory, where each sport has had similar prominence at different times throughout history – although the rugby codes have established greater prominence there in the decades since it was first proposed.