How to trap medieval humans in a land using geology?

These humans must never see the ocean and should still be able to survive. They can only get out of the land if they improve the technology level. Is it even possible? The lakes or seas should probably not be connected to the ocean because otherwise the humans can just follow a river to go out of the land. So the inland bodies of water just evaporate at the same rate as water is added to them. Medieval humans can surely cross mountain ranges right? If volcanoes are surrounding them, can't they just wait till the volcanoes stop erupting then cross it while it's cool? I'm looking for a way that's natural and using geology.

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How to trap medieval humans in a land using geology?

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