Fjaðrárgljúfur is a narrow canyon in South Iceland carved by the Fjaðrá river, known for its steep colorful walls that rise about 100 meters above the water. The canyon is a short walk from the main road and offers dramatic views of the layered rock formations and the river winding below, making it a popular photography spot along Route 1. It's worth a stop if you're driving through the south coast, especially in good weather when the light brings out the colors of the canyon walls.