Final answer:
Ontario is known as the Land of 100,000 Lakes due to its vast number of lakes, including the Great Lakes.
Step-by-step explanation:
The province known as the Land of 100,000 Lakes is Ontario.
The nickname refers to the vast number of lakes found in the province, including the Great Lakes (Superior, Ontario, Huron, Erie, and Michigan), as well as thousands of smaller lakes. Ontario has a diverse geography that includes forests, rivers, and wetlands, making it a perfect habitat for numerous lakes.
Other provinces mentioned in the options, such as Alberta, Manitoba, and Saskatchewan, also have lakes, but Ontario is particularly known for its abundance of lakes.