Abra de Rota
Abra de Rota is a high mountain pass at an elevation of 4.405m (14,452 ft) above the sea level, located on the Salta and Jujuy provinces border, in Argentina.
The road to the summit is gravel. It’s steep. Do not travel this road in severe weather conditions. The climb is simply terrible, with a notorius lack of oxygen that tests the organisms and a high degree of steepness. Most people feel altitude sickness at around 2,500-2,800 meters. The surface on this gravel road is often loose, especially along the sides of the road. This track can get very muddy and slippery after rain making it challenging to get through. During and after a storm the road may be impassable, even with a four-wheel-drive vehicle.
Pic: http://www.losviajesdevickyyened.com/2016/08/de-yavi-pucara-san-roque-por-abra-de.html