Here's why it's tricky:
* All provinces have some natural features: Every province in Canada has mountains, rivers, lakes, or coastlines.
* What counts as a "boundary"?: Do we mean a complete, continuous feature that acts as a distinct border? Or can it be more subtle, like a change in terrain?
Possible interpretations:
* Saskatchewan: It is often said to have no natural boundaries as it is primarily defined by straight lines, unlike provinces with mountains or coastlines. However, it does border on the Canadian Shield and the Great Plains, which could be considered natural features.
* Manitoba: Similar to Saskatchewan, it is mostly defined by straight lines. However, it also borders Lake Winnipeg, the Red River, and the Assiniboine River, which are natural features.
Ultimately, there isn't a single "correct" answer without a clearer definition of what a "natural boundary" is.
Let me know if you have a specific definition in mind, and I'll be happy to give you a more precise answer!
