How Would I Make an Oceanless World Feasible?

The planet I'm thinking of is of similar size and distance from its star relative to Earth, but it lacks oceans, instead consisting of one massive continent with a huge mountain range (reminiscent of the Andes) running east-to-west around the equator, forming an almost perfect mountainous "ring" around it. To the south of this mountain range is a vast tropical rainforest, and to the north is a massive desert. The mountain range itself tends to chop up air masses and creates microclimates. How feasible would a world like this be, and what changes to the climate I already have set for it would I need to make to make it be able to support human civilization with no oceans?

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How Would I Make an Oceanless World Feasible?

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