Rivers on the Wood River outwash plain: changes in historical times. The middle drawing in the bottom row depicts the situation at the beginning and end of the nineteenth century, with most of the water in Wood River (Markarfljót) flowing through its Cross River (Þverá) channel.

Source: Hreinn Haraldsson, "The Markarfljót Sandur Area, Southern Iceland: Sedimentological, Petrographical and Stratigraphical Studies," Striae 15 (Uppsala: Societas Upsaliensis pro Geologia Quaternaria, 1981), 3-58, Fig. 53.