The Zumbro River is a tributary of the Mississippi River in the Driftless Area of southeastern Minnesota in the United States. It is 64.6 miles (104.0 km) long from the confluence of its principal tributaries and drains a watershed of 1,428 square miles (3,700 km2). The river's name in English is a change from its French name Rivière des Embarras due to its mouth near Pine Island in the Mississippi River; the pronunciation changed from to. The Dakota name for this river is Wapka Wazi Oju, having reference to the grove of great white pines at Pine Island.