Vuelta a Colombia Stage 12: Paipa - Güicán, 217km
Climbs: Cerinza (cat.3), Canuto (cat.2), La Uvita (HC), San Mateo (cat.1), Güicán (cat.1)
Next comes the queen stage. It doesn't have the hardest climbs of the race (all the climbs are moderately steep, but fairly long), but the constant climbing and the sheer length of the stage make this a very tough stage.
The stage starts in Paipa, still 2500m above sea level, then heads into the Pantano de Vargas, the place where one of the bloodiest and most important battles of the Colombian Independence War took place. They then head into Duitama, best known in the cycling world for hosting the 1995 Cycling Road World Championship, one of the hardest world championship races of all time, both due to the altitude and due to the very difficult circuit selected for the race.
We won't head into the city for long, though. After Duitama we keep heading northeast, taking on the first two climbs of the stage. The second of these peaks at almost 3400m above sea level; the altitude will again be a key factor, but this time riders will have had more time to acclimate themselves. The climb's followed by a very long and irregular descent into the Chicamocha river, followed by the first of the three chained climbs that make up the definitive part of the stage: the long and difficult climb to La Uvita, with two fairly steep sections separated by about 5km of false flat in the middle. Attacking here will be risky, but a good attack will be very hard to chase after, so it may be worth it.
The second climb of the trifecta, San Mateo, is also the easiest one. A gradual climb with slopes constantly around 6%. Not too steep, but more than enough to keep the leader's group on edge.
After San Mateo we reach the foot of the final climb of the stage, up to Güicán, on the slopes of the Ritacuba Blanco, the tallest peak of the Cordillera Oriental. The mountain is one of Colombia's few snow-covered peaks, but global warming is making the snow line retreat upwards at an alarming rate. If trends remain as they are, the snow will be all but gone by 2025.
The ride up to Güicán is pretty irregular, with short steep sections sloping up to 10% separated by false flat zones. The slopes even out a bit towards the end, with the final 4km of the climb constantly around 7%. GC contenders will look to break their group apart with a strong attack in this climb. If any contender shows weakness in any of the climbs at the end of the stage, though, all bets are off; teams should get filtered out by the mountains, and the constant climbing and descending throughout the last 120km of the stage means that catching up will be very difficult.