Abra Anta Q'asa is a high mountain pass at an elevation of 4.881m (16,013ft) above the sea level, located in the Andes of Peru.
The pass lies on the border of the Junín Region, Yauli Province, Marcapomacocha District, and in the Lima Region, Huarochirí Province, Chicla District. Watch out for sudden loose-gravel breaks. Wet conditions may make for tough driving along the muddy road. After rain, even a single rainfall, conditions of the road can be challenging. The unpaved sections of the road can be impassable when wet. The road over the pass, also known as Antaccasa or Antajasa, is gravel. There are some sandy sections and the road includes some hairpin turns, pretty dangerous. It’s not really much steep. The pass is traversed by the JU-116, a very busy road. Great trail for experienced wheelers. Avoid driving in this area if unpaved mountain roads aren't your strong point. Stay away if you're scared of heights. Expect a trail pretty steep. The pass is located between Marcapomacocha (27km) and Casapalca (16km).
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. Near the pass, oxygen is in short supply. It has a well-deserved reputation for being dangerous because of unpredictable snowstorms and blizzards, and driving under these conditions, can be extremely challenging. Watch out once you reach the Carretera Central – it is rammed with traffic, and a very dangerous road to cycle.