Cima de Liena is a high mountain pass at an elevation of 2.566m (8,418ft) above the sea level located within the Ordesa y Monte Perdido National Park, in Aragon, Spain, south of the Pyrenees. It's one of the highest mountain roads of Spain.
The road to the summit, also known as Pico de la Liena, is called GR 11 (or Camino de las Pardas o de los Ingenieros) and has 2 separate parts, starting from the small town of Chisagues. Do not travel this road in severe weather conditions. Avalanches, heavy snowfalls and landslides can occur anytime, being extremely dangerous due to frequent patches of ice.
The first kilometers are asphalted and then gravel but in good conditions. There are some narrow sections -scarcely wide enough for two cars- where if two vehicles have to pass each other, one might have to reverse for some kilometers of winding narrow road to get to a place wide enough to pass. The first part of the climb ends near the Minas de Ruego, an abandoned mine. At this point, at 1.670 m above the sea level, there’s a small parking lot. Open to all motorized vehicles, however, strongly recommended for high clearance, 4-wheel drive vehicles.
The second part is extreme. Only 4x4. It shouldn’t be attempted by those who don't know how to reverse. This road tests the skill, and courage, of any driver. It’s definitely not for anyone suffering from vertigo or a fear of landslides. The road is gravel and rocky, very narrow, steep, and with 1.500m of elevation gain. Your wheels will be astounded at the wonderful views of the mountains spread out before you! They are terrible for drivers who are prone to vertigo. In many places the road is bordered by a drop of hundreds of meters (many hundreds of feet) unprotected by guardrails.