Glaciations have an effect on arid and semi-arid regions.
Precipitations that feed the glaciers determine the formation and development
of large rain lakes that develop in relatively arid regions, where there were
no established drainage systems.
In Canada, the weight of the ice has created a vast depression
around the Hudson Bay which is now below sea level. The same happened in Europe
for the Baltic Sea.
The Vital Needs Theory - page 96