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do a loop
That would be massive though - starts in Catalunya and heads down to Portugal.
If you deffo wanted to do the Divide you'd need to fly in with cardboard box and get another one to fly out at the finsh or you'd have to fly/train/drive back to the start which seems kinda silly.
MV has a tonne of loop routes you could do if you weren't dead set on a "divide". We did Maestrazgo Loop over Xmas but there's bigger ones like Montanas Vacias.
The easiest would be to do a loop and fly there and store the box somewhere.