Literally ‘stinking waters,’ these hot, high-sulfur thermal springs 16km from Tulcán and 6km beyond the town of Tufiño certainly live up to their name. Many of the pools are on the Colombian side of the border; you can cross the border on a day pass, but those who want to stay overnight must enter via the Tulcán border crossing. Get there before 4pm, when the springs take on extra stench; go on weekdays to avoid crowds.