Some 12km after the turn-off to Tlos heading south, this spectacular gorge is really just a fissure in the Akdağlar, the mountains towering to the northeast.
Around 18km long, the gorge is too narrow in places for even sunlight to squeeze through. Luckily you can, but prepare yourself for some very cold water year-round – even in summer. If you don't want to get your shoes wet while fording the river, plastic shoes and helmets can be rented (₺5).
You approach the gorge along a wooden boardwalk towering above the river. On wooden platforms suspended above the water, you can relax and drink tea while watching other tourists slip and slide their way across the river, hanging onto a rope and then dropping into the gorge proper. Good footwear is essential.