This is a map of the rubber estates in the Krian district measuring 900 x 620 mm. The area shaded in blue pencil traces the Bukit Merah dam, which provided water for all the rice fields in Krian and the estates in the Parit Buntar/Bagan Serai region. The map is undated, but Laurence Connolly, who donated it, and was posted to the Gula Estate in 1949, states that it predates the Second World War. The Bukit Merah dam was constructed in 1906.