Shortly after crossing the modern-day state line of Wyoming and Utah, the pioneers entered a unique almost 20-mile-long canyon. On the north side, the walls were over 600 feet high. The canyon has come to be called "Echo Canyon". "There was a very singular echo in this ravine, the rattling of wagons resembled carpenters hammering at board inside the highest rocks. The report of a rifle resembled a sharp crack of thunder and echoes from rock to rock for some time. The lowing of cattle and braying of mules seemed to be answered beyond the mountains. Music, especially brass instruments, had a very pleasing effect and resembled a person standing inside the rock imitating every note. The echo, the high rocks on the north, high mountains on the south, with the narrow ravine for a road, formed a scenery at once romantic and more interesting than I have ever witnessed." – William Clayton, 1847