Adelaide, SA, Australia

Adelaide, SA, Australia: Submarine Cable Landing Point

Adelaide is the capital city of South Australia and sits on the Adelaide Plains, facing the Gulf St Vincent along Australia's southern coastline. The city is set to become a submarine cable landing point with the arrival of the Sydney-Melbourne-Adelaide-Perth (SMAP) cable, currently scheduled for completion in 2026. This development positions Adelaide as a node within a domestic submarine cable corridor connecting multiple major Australian coastal cities.

The single cable landing at Adelaide is a domestic system, linking Adelaide to other Australian cities rather than to overseas destinations. This makes Adelaide's submarine cable infrastructure intra-national in character, supporting connectivity across Australia's southern and western seaboard rather than forming part of an intercontinental route.

Cables Landing at Adelaide, SA, Australia

The Sydney-Melbourne-Adelaide-Perth (SMAP) cable is a 5,000-kilometre domestic Australian submarine cable system with a draft Ready-for-Service (RFS) date of 2026. As its name indicates, the cable connects Sydney, Melbourne, Adelaide, and Perth — all located within Australia — forming a coastal ring or corridor along the country's southern and western margins. Adelaide serves as one of the intermediate landing points along this route, linking South Australia into a nationally oriented submarine cable network for the first time.

Regional Context

Among Australia's submarine cable landing points, Adelaide is one of the newer additions, with its sole cable still in the draft planning stage ahead of a 2026 RFS date. By comparison, Sydney, NSW leads the country with eight cables, while Darwin, NT hosts four, and several other locations including Perth, WA — also a landing point on the SMAP system — each host two cables. Adelaide's emergence as a landing point adds South Australia to a coastal network that has historically been concentrated in New South Wales and, to a lesser extent, Western Australia and the Northern Territory.

Network Role

Adelaide's role in the submarine cable graph is defined entirely by the SMAP system, making it a single-cable terminus at the time of writing. The SMAP cable establishes a direct submarine link between South Australia and the eastern seaboard cities of Sydney and Melbourne, as well as Perth on the west coast, creating a domestic coastal corridor spanning 5,000 kilometres. Once operational, Adelaide will represent the only submarine cable landing in South Australia.

As a single-cable landing point on a domestically focused system, Adelaide occupies a modest but distinct position within Australia's submarine cable geography, extending national submarine connectivity into a state that previously lacked a direct undersea link to other Australian cities.