[Eric in the Ozarks]

If the oceans were rising, wouldn’t the St. Lawrence run backwards ?

[bert]

———If the oceans were rising, wouldn’t the St. Lawrence run backwards ?———

That would mean Lake Michigan would rise and the narrow link to the Chicago River would be inundated and then the flow in the Mississippi would increase up to the point where it met the increased level coming northward from New Orleans where it would destroy Cairo.