What was the name of the lake formed when the Great Lakes were combined together?

Lake Nipissing is the name of the lake formed as a result of the geological processes during the post-glacial period, when water levels rose and combined various bodies of water. It is located in Ontario, Canada. The formation of Lake Nipissing was influenced by the melting glaciers of the last Ice Age, which reshaped the surrounding geography and created many lakes and waterways.

In the context of the Great Lakes, the combined waters that existed in a more extensive form before the current configuration of the Great Lakes resulted in various hydrographic changes in the region. While Lake Superior, Lake Michigan, and Lake Erie are all significant lakes within the Great Lakes system, they represent distinct bodies of water that did not form as a combination of the Great Lakes themselves but rather as independent lakes shaped by glacial activity.