Gingin Brook is an important perennial stream in the Moore-Hill Basin. It is 46km long and has a catchment of 1,370km2. The river system starts north of Gingin and flows into the Moore River ~12km east of Guilderton. Gingin Brook is the only remaining freshwater creek passing over the Swan Coastal Plain. It has almost permanent flow since it is fed by springs and groundwater in addition to surface water flows.