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Option 1: Superior - US-Canada
This option is correctly matched. Lake Superior is the largest of the Great Lakes and it is located between the United States and Canada. So, this option is not the correct answer.
Option 2: Baikal - Russia
This option is correctly matched. Lake Baikal is located in Russia and is the deepest and oldest freshwater lake in the world. So, this option is not the correct answer.
Option 3: Great Bear - Canada
This option is correctly matched. Great Bear Lake is the largest lake entirely in Canada and it is located in the Northwest Territories. So, this option is not the correct answer.
Option 4: Great Slave - Russia
This is the correct answer. Great Slave Lake is located in Canada, not Russia. It is the second-largest lake in the Northwest Territories of Canada. So, this option is the pair that is not correctly matched.
In conclusion, option 4, Great Slave - Russia, is the pair that is not correctly matched.