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For one of the most exhilarating experiences of your life, zip line with LimiteZero, over the River Guadaina from Spain to Portugal. It’s the first cross-border zip line in the world. It is approximately 2,362 feet long and reaches speeds up to about 40 to 50 mph. Once you reach the end of the zip line in Portugal, you can decide whether you want to hop on a ferry back to Spain, or stay in Portugal until the end of your trip.