The Chapman River is an ephemeral river located in the Greenough Basin. It is 80km long and has a catchment of 1,644km2. The river system starts east of Yuna and drains the farming areas of the Shire of Chapman Valley. It enters the ocean at the Chapman River Estuary, in the northern suburbs of Geraldton. The estuary is ~1.5km long and only opens to the ocean during higher river flows in winter.