Rumichaca means stone bridge in Quechua, and the name is literal: here the Carchi River, which becomes the Guáitara on the Colombian side, flows beneath a natural arch of rock that has carried travellers between what are now Colombia and Ecuador for centuries. The Inca road passed this way, and a segment of the Qhapaq Ñan near the crossing is part of the World Heritage listing. Today the main border post between the two countries sits right here, with the modern bridge carrying the Pan-American Highway beside the old crossing.
Ipiales, three kilometres away, is the Colombian border city, a busy, chilly place at close to three thousand metres with markets, money changers and bus terminals. On the Ecuadorian side, Tulcán is famous for its cemetery, where cypress hedges have been clipped into extraordinary topiary figures, and it is worth an hour if you are crossing. Both towns are working towns rather than pretty ones, but they have everything a traveller needs.
For riders the main thing here is paperwork. Crossing with a vehicle means temporary import documents, passport stamps, and insurance requirements on each side, and the queues can be long, especially around holidays. Arrive early in the day, have copies of everything, and be patient. Fuel prices differ noticeably between the two countries, which is why you will see people filling cans; follow the rules and do not carry fuel across.
The road itself is the Pan-American, paved, high and often misty, with heavy trucks grinding up and down. North toward Pasto it winds through the Andes with long climbs and deep valleys; south into Ecuador it heads toward the páramo grasslands and the Ecuadorian highlands. Wet weather is common, and visibility can drop to a few metres in cloud. Ride with lights on and expect animals and pedestrians on the shoulder.
Nearby, the Las Lajas sanctuary, built on a bridge over the Guáitara gorge a short ride from Ipiales, is the essential detour. Pupiales, a small town to the northwest, is quieter than Ipiales. Ipiales has the most reliable fuel, food and lodging on the Colombian side, Tulcán on the Ecuadorian side. Dress warmly; even on a sunny day the wind at the border bites.