What is the minimum distance needed between physically distinct races?

If there are several races with very distinct appearances (e.g. Nordic-pale vs. Arabic-tan skin, red vs. black hair, etc.), how much space / natural barriers do I need between their homelands to justify these distinctions?

Also, some of the races may have cultural taboos against interbreeding, but most do not.

(In this case, there is a desert in the center of the known world, with several oasis cities scattered in it, and other cultures are more or less evenly spaced around it.)

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What is the minimum distance needed between physically distinct races?

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