The South Opuha River is a river of the Canterbury Region of New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

's South Island

South Island

The South Island is the larger of the two major islands of New Zealand, the other being the more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman Sea, to the south and east by the Pacific Ocean...

. It flows south down a valley between the Two Thumbs Range and the Sherwood Range from its origins northwest of Mount Misery

Mount Misery

-In the United States:* Mount Misery, a rocky hill in Pachaug State Forest, Connecticut* Mount Misery, a hill in the town of Auburn, New Hampshire* Mount Misery, or Valley Forge Mountain, in Tredyffrin Township, Pennsylvania...

 before turning southeast around the southern end of the Sherwood Range to reach the western shore of Opuha Lake, of which it is a major inflow.