A gorgeous and long climb starting at the foot of the Andes. Reasonably steady gradient of 5-7%. What makes this tough is not the gradient but its length and the total ascent of more than 2,500 meters. It is advisable to cycle this with a following car to provide security from the frequent trucks, busses and pick-ups that go up and down this road at high speed. Make sure you have enough supplies with you, as there is only the one gas station just before Ducur.