How can I ensure that a supercontinent has fertile ground away from coastal areas?

In this world, the continents never split off from each other. They stayed connected into the one giant landmass called Pangea. Humanity developed on this supercontinent, separated by landmarks instead of oceans.

Given this scenario, it is logical to assume that fertile ground would only be near the water, limiting the amount of livable land to coastal areas. Farther inland would be arid, dry deserts where very little could grow, and hurting the possibility of civilizations flourishing. I want this supercontinent to have fertile, tropical areas inland instead of just by the coast. What is required to make this possible?

posted almost 7 years ago

System‭

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