Currie made three expeditions south of the Swan during 1829. In July he led an exploration south of Fremantle. He was accompanied by botanist James Drummond, Dr Simmons and Lieut. George Griffin. From the coast at the present day town of Rockingham they moved inland and climbed a small hill, now named Baldivis. From the summit of this hill they could see a course of water, that Currie later referred to as the Serpentine. This name first appeared on a map published by the Royal Geographical Society in 1832. At one time this river was mistaken for the Murray River.