The retreat of the Rhine glacier (at the end of the Würm ice age) occurred as a number of melting and stationary phases, which are conventionally divided into nine stages. Stage 9, the Constance stage, begins with the edge of the ice at a standstill near Constance. The ice edge east of the glacier was along a line from the Lake Überlingen via the eastern tip of Bodanrück, through Constance and Kreuzlingen to the northern end of the Seerücken.