The Narrows is the upper section of Zion Canyon, where the gorge closes to perhaps six metres wide between walls that rise three hundred metres straight up. You walk in the river itself; there is no other path. From the end of the canyon road, the route runs upstream as far as a side canyon called Big Spring (a sixteen-mile round trip) or, with a permit, the full length from the top down (a two-day trip).
Equipment matters. A walking pole helps in the current, and shoes that drain and grip wet rock are essential — outfitters in Springdale rent canyoneering boots, dry pants, and neoprene socks. Water temperature is around 10°C even in summer. Do not enter if rain is forecast. The light through the walls in midday is golden and overwhelming, and the experience genuinely matches the hype.