The Cardrona River is found in Otago in the New Zealand. It is the first tributary of the Clutha River, which it meets only five kilometres from the latter's origin at the outflow of Lake Wanaka.
The Cardrona flowsnorth for 40 kilometres down the steep narrow Cardrona Valley, which is also the location of one of New Zealand's most notoriously difficult roads, the Crown Range route.
The Clutha River is the second longest river in New Zealand and flows south-southeast for 340 kilometres through Central and South Otago to the Pacific Ocean, 75 kilometres south west of Dunedin.
The ultimate source of the river is at the end of the Makarora River, close to the saddle of the Haast Pass, which flows into the northern end of Lake Wanaka.
The river then flows southeast through the scenic Cromwell Gorge to Clyde and nearby Alexandra, where it is joined by the waters of the Manuherikia River.