How can I keep sapient species away from each other?

Many other questions, as well as a few online sources, all agree that in order for me to have multiple sapient species in my world, they need to be either separated by a natural landscape or not a source of competition to each other. The easier solution here is to just set up a natural barrier in between the two species. What natural barriers can I use to keep my developing sapient species away from each other?

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How can I keep sapient species away from each other?

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