|Riddoch Highway near Padthaway|
|Length||239 km (149 mi)|
|North end||Dukes Highway, Keith, South Australia|
|South end||Cape Northumberland, Port MacDonnell, South Australia|
|Major settlements||Padthaway, Naracoorte, Coonawarra, Penola, Tarpeena, Mount Gambier|
|Highways in Australia
National Highway • Freeways in Australia
Highways in South Australia
The Riddoch Highway in south-eastern South Australia branches from the Dukes Highway at Keith and travels south through Padthaway, Naracoorte, Penola, Nangwarry, Tarpeena, and Mount Gambier to Port MacDonnell and nearby Cape Northumberland.
The highway has been designated as State Route A66 between Keith and Mount Gambier. The remainder, between Mount Gambier and Port MacDonnell has been labelled State Route B66, although this is not officially known as the Riddoch Highway.
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