Behind the Oymapınar Dam, up in the Taurus range, the sea is nowhere in sight: this is a freshwater canyon lake, mirror-calm and startlingly green. Sheer cliffs drop straight into deep clear water, and the boat glides between them past strange rock formations and the floating cages of working trout farms.
Guests staying along the Kumköy and Side resort strip get the shortest run inland of all our Green Canyon departures, which keeps the whole outing to about seven hours. After hotel pickup you head for the hills, board at the reservoir and spend the day drifting beneath pine-topped walls with the Taurus peaks all around.
The boat anchors at secluded coves where you can dive straight off the deck — the lake never really warms up, which is precisely what makes it so refreshing in July. A freshly grilled lunch is served in the open air, an English-speaking guide handles the rest, and you are back in Kumköy before dinner.