Situated in Turkey's Muğla province, Saklikent Gorge has earned its stripes as one of the deepest canyons in the world and a veritable cornucopia of exhilarating landscapes and thrill-seeking opportunities. Reached from nearby tourist towns like Fethiye, Kas, and Kalkan in less than an hour via the Fethiye - Antalya Highway, Saklikent's stats tell the story: 18 km (11 miles) in length and a maximum of 500 meters (1640 feet) in height from the precipitous cliff tops to the icy waters below, with local tour operators providing Jeep tours, rafting expeditions up to two hours in length, and even canyoning opportunities up and down a few of the waterfalls along the way.
Although you'll miss out on the intimate knowledge of a local guide, Saklikent Gorge can be an adventure on your own, especially in early summer when the chilly water rises above your waist. If you really want to explore the whole canyon, then you'll need to leave the suspended walkways and brave the rushing water in comfortable shoes and clothes that you don't mind getting wet. Also, be sure to avoid going at mid-day, especially in the summer when tourism is at its peak; the crowds can really detract from the beauty of this place.
Take a half day to hike around this incredible landscape and then afterward you can retire for a beer or a trout dinner at the on-site bar and restaurant; something you'll probably be able to afford since admission is only about $3 USD. Of course, if you're really into sticking around, there are literal wooden treehouses meant for overnight accommodation near the rafting offices. Browse the included links for more on local tour operators, adventure activities, and further information.
Note:If you want to combine the adventurous circumstances of Saklikent Gorge with a nearby cultural landmark, then the Lycian ruins of Tlos are a no-brainer. This 4,000 year old collection of ancient buildings led by a crumbling hilltop fortress is only a few minutes' drive away.