Fortymile Gulch and Willow Gulch are tributaries of the Escalante River, located in Kane County in southern Utah, in the western United States. With a combined length of over 20 miles (30 km), they exhibit many of the geologic features found in the Canyons of the Escalante, including high vertical canyon walls, water pools, narrow slot canyons, domes, and arches. Popular recreational destinations, they are located within the Grand Staircase-Escalante National Monument.