The Australian Overland Telegraph Line was a 3200 km telegraph line that joined Darwin with Port Augusta in South Australia. Completed in 1872 the Overland Telegraph Line allowed fast communication between Australia and the rest of the world. It was one of the great engineering feats of 19th century Australia. It followed the route discovered by the explorer John McDouall Stuart in 1862. It was probably the most important milestone in Australia's telegraphic history.