Figure 12.3 Position of the Volga delta marine edge in 1807 to 1817 (blue), 1920 (red), 1941 (orange), and in 1991 (green) with a Caspian Sea levels of -25.0, -26.1, -27.8, and -27.3 m, respectively. The shoreline positions are mapped on a base map of distributary channels in 1920.
