It is the national heritage icon that South Australians have relied on to determine good farming land from marginal for more than a century.
Drawn by the state's surveyor general in 1865, Goyder's Line has shaped communities and agriculture ever since.
On its 150th anniversary, take a look at what life is like for those living on the line today, how it influenced the past and what is in store for its future.
Goyder's Line runs across South Australia from Ceduna in the west, across to the Spencer Gulf, north to Orroroo, then south and east to the Victorian border at Pinaroo.
Jeff Spark's farm is near Jamestown, right in the heart of agricultural country marked out by the line.
Compared to the more "opportunistic" croppers north of Goyder's Line, farmers like Jeff regularly reap higher tonnes per hectare from their land.
Goyder's Line marks out the limits of 'reliable rainfall' and separates agricultural country south of the line from drier pastoral country to the north.
Ian's farm is above the line, just outside Orroroo, and there are points on his property where he can see Goyder's Line.
This year has had unusually productive rainfall for cropping, but in most years, Ian said the variable rainfall meant the farm used a roughly 60-40 split between livestock and crops.
Abandoned stone cottages surrounding towns like Orroroo are the remnants of a push north from settlers in the years after Goyder's Line was drawn.
Higher rainfall in the years after 1865 encouraged farmers, most of them completely unfamiliar with the Australian climate, to believe they could grow wheat above Goyder's Line.
They pressured the government to open the land for farming, and a land boom took over in areas outside Goyder's Line.
The surveyor general was eventually proved right when a severe drought returned and many settlers were left ruined.
Most farmers in Goyder's time were illiterate and had little experience in agriculture.
Many of them were familiar only with the European climate and had no concept of the unreliable conditions of inner Australia.
Goyder's insights into the challenging climate for farming in the interior of Australia put him ahead of his time.
Having a property in the foothills of the Flinders Ranges gives Kym Fromm a unique insight into the changes in store for Goyder's Line.
After 150 years as a reliable marker of climate, there are now concerns from scientists and farmers that the line may be moving due to climate change.
Although Kym would be one of the first to see the effects if the line moves south, he said he was hopeful that innovative farmers in the region would adapt their practices to a changing climate.
Malcolm Parish said viticulturists in the Clare Valley, one of Australia's premium spots for wine, have held forums to discuss how they could adapt their wine making and grape growing practices to a changing climate.
Although he does not believe Goyder's Line will move as far south as the Clare Valley, Malcolm said climate change is still a concern for growers in the region.
Malcolm said they had already started planting new varieties of grapes that would be able to handle the warmer climate.
Unlike most of the people who commemorate George Goyder, Candy Brumpton has a personal connection to his work.
She is the great-great-grandaughter of Goyder's marriage to Frances Smith, a union which ended when Frances died in 1870 from an overdose.
Candy said she imagined it must have been a "pretty lonely life" for her great-great-grandmother while Goyder was away in the saddle.
Although she was not aware of the work of her famous forebear until her first visit to South Australia 20 years ago, Candy said she was "very proud. He was incredible and well before his time".