Oymapınar Dam, completed in 1984 on the Manavgat River, created a 470-hectare reservoir that submerged ancient caravan routes and transformed a limestone gorge into the emerald corridor visitors now call Green Canyon. The reservoir sits 350 metres above sea level, fed by snowmelt from the western Taurus range. Its name derives not from canyon walls — which remain ochre and grey limestone — but from the dense Mediterranean pine and cedar forests that crowd the shoreline, their reflection staining the water an improbable jade. The dam itself is a concrete gravity structure 185 metres high, built to supply hydroelectric power to the Antalya and Alanya coastal strip. Its completion flooded narrow gorges and created a network of inlets accessible only by boat. Tour vessels depart from the eastern pier near the dam wall, navigating a thirteen-kilometre circuit that loops through the widest arms of the reservoir. The water is consistently calm — the surrounding peaks shelter it from Mediterranean wind systems — and remains between 18 and 22 degrees Celsius year-round, fed by subterranean springs and tributary streams. Boat tours operate on flat-bottomed wooden gulets, traditional Turkish coastal vessels adapted for reservoir use. Most carry between 30 and 50 passengers on open decks fitted with bench seating and canvas awnings. The standard circuit takes five and a half hours, including a swimming stop at the mid-point inlet and a lakeside lunch service. Meals are prepared on board or at moored platforms and typically consist of grilled chicken or fish, seasonal salads, rice pilaf, and fruit. Soft drinks and tea are included; alcohol is available for purchase. The appeal lies in the landscape compression. You pass within metres of sheer rock faces where mountain goats pick across vertical seams, then round a bend into open water framed by peaks that rise 1,200 metres above the reservoir surface. The pines give way to scrub oak and wild pistachio at higher elevations. Bird activity peaks in spring and autumn during migration windows; grey herons and cormorants are resident. The water clarity allows visibility to three metres in most sections, revealing submerged boulders and occasional remnants of pre-dam stone walls. The green canyon boat trip Alanya tour has become the primary access route to this drowned topography, replacing the dirt tracks that once threaded the gorge floor before the reservoir filled.