The Hurunui River South Branch is a river in the Hurunui District of Canterbury, New Zealand.
The river originates in the Crawford Range, with southern tributaries flowing from the Dampier Range. [1] One of the inflows on the true-left is Mason Stream, which flows through Lake Mason. [2] One of the larger inflows on the true-right is the North Esk River. [3] The only bridge over the Hurunui River South Branch is part of Lake Sumner Road shortly before the river's confluence into the Hurunui River.
42°45′10.8″S 171°56′24″E / 42.753000°S 171.94000°E