Palo Duro Canyon is a canyon system of the Caprock Escarpment located in the Texas Panhandle near the city of Amarillo, Texas, United States. As the second largest canyon in the United States, it is roughly 193 km (120 mi) long and has an average width of 10 km (6.2 mi), but reaches a width of 32 km (20 mi) at places. Its depth is around 250 m (820 ft), but in some locations it can increase up to 304 m (997 ft).