The Tod Reservoir is located on the Eyre Peninsula in South Australia, in the localities of Whites Flat and Koppio, 27 km north of Port Lincoln. It is situated on the Tod River, the only stream on Eyre Peninsula, South Australia providing reliable flows; the reservoir is supplied by concrete channels fed from weirs constructed across the Tod River and its major tributary, Pillaworta Creek. The river was named after Robert Tod, who discovered it during explorations in 1839. The Tod River flows into Louth Bay in Spencer Gulf. The reservoir is listed on the South Australian Heritage Register.