How long a footbridge could you make from natural materials?

If I was designing a world for a culture living in a rain-forest and their land was cut through by many vast ravines then what sort of spans could they bridge just using the materials naturally available to them?

I expect that the limiting factor would be the maximum feasible tensile strength for rope made purely out of natural materials, in which case what could be done to increase that?

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How long a footbridge could you make from natural materials?

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