Orroroo is a town in the Yorke and Mid North region of South Australia. At the 2016 census, the locality of Orroroo had a population of 610 while its urban centre had a population of 537. The Wilmington-Ucolta Road passes through here, intersecting with the RM Williams Way which leads to the Birdsville and Oodnadatta Tracks. The Peterborough–Quorn railway line extended from Peterborough to Orroroo also in 1881 and Quorn in 1882, connecting with the new Central Australia Railway from Port Augusta. These railways have now been abandoned. Orroroo is situated near Goyder's Line, a line drawn up in 1865 by Surveyor General Goyder which he believed indicated the edge of the area suitable for agriculture.

Wilmington–Ucolta Road is a 100 kilometre major road connecting Port Augusta to Peterborough and beyond to Broken Hill, in South Australia. This name covers many consecutive streets and is not widely known to most drivers except, as the entire allocation is still best known as by the names of its constituent parts: Willowie Road, Petersburg Road, and its concurrency along RM Williams Way. This article will deal with the entire length of the corridor for sake of completion, as well to avoid confusion between declarations.