Quick answer
A plain, honest explanation of why the water at Green Canyon looks so green: deep, still, mineral-rich reservoir water on the Oymapinar lake plus the reflection of pine-clad canyon walls. Includes a factor-by-factor colour table, prices and FAQs.
Green Canyon looks green for two reasons working together. The water is a deep, still, mineral-rich reservoir — the Oymapinar lake formed behind a dam on the Manavgat river — and deep freshwater like this scatters light towards the green-blue end. On top of that, the steep pine-clad canyon walls reflect their colour across a mirror-flat surface, and you can see it for yourself on our Green Canyon boat tour.
The short answer: deep water plus green reflections
We run boats on this lake, so we get asked about the colour on almost every cruise. There is no dye and no trick. The green comes from the physics of deep, clear, mineral-rich water combined with what is sitting above and around it: pine forest on steep canyon walls. Put a calm reservoir under that, and the surface reads as green rather than the ordinary blue of open sea. Our cruise spends the day out on this water with swim stops along the way, so you can judge the effect from the deck.
What Green Canyon actually is
Green Canyon is a boat cruise on the Oymapinar reservoir, an emerald-green freshwater lake inland from Manavgat in the Taurus mountains. The lake was formed in the 1980s when the Oymapinar dam was built across the Manavgat river, flooding a steep-sided river valley. That history matters for the colour: this is not a natural rock pool or a stretch of coast, it is a deep artificial lake held between tall canyon walls, which is exactly the setting that produces the green you see in photographs.
Because it is a lake and not the sea, the water is calm — no waves, no swell, no seasickness. That flat surface is a big part of why the reflections read so strongly.
Reason one: deep, mineral-rich reservoir water
Water is not truly colourless once you have enough of it. In a shallow glass it looks clear; in a deep body it starts to show colour, because water absorbs the red and orange parts of sunlight and lets the blue and green parts travel further. In a very deep, clean lake like Oymapinar, that effect is strong. The water is also mineral-rich, having sat over rock and been fed by mountain sources, and dissolved minerals and fine particles nudge the tint away from plain blue and towards green.
The stillness helps too. A calm reservoir does not churn up the way open sea does, so light passes cleanly into the water and comes back with that deep, glassy green-blue quality rather than a broken, foamy grey.
Why deep lakes go green while shallow bays stay clear
In a shallow bay you mostly see the sand or rock below, so the water looks pale and clear. Over the deep channel of a flooded canyon there is no bottom close enough to see — light travels down, the reds are absorbed, and the green-blue that returns is what your eye picks up. Depth is doing a lot of the work here.
Reason two: the reflection of pine-clad canyon walls
Now add the surroundings. Oymapinar sits between tall, steep walls covered in pine forest. On a calm day the lake behaves like a mirror, and a mirror reflects whatever is above it. With green forest rising on both sides, a great deal of green light lands on the surface and bounces back to you. This is why the water can look far greener close to the shaded canyon walls than it does out in bright open sun.
So the honest answer is not one single cause. It is deep mineral-rich water giving a green-blue base, and green reflections layered on top. Together they produce the emerald that gives the canyon its name. You can judge the effect yourself from the deck — guests join us from Side, Manavgat, Kumkoy, Belek, Alanya and Antalya for exactly this reason.
Factor vs effect on colour
Here is how the main factors add up. This is general science applied to a deep mountain reservoir, not lab data for this specific lake.
| Factor | Effect on the colour you see |
|---|---|
| Great depth | Absorbs red light, lets green-blue travel and return — the base tint |
| Dissolved minerals | Shifts the tint from plain blue towards green |
| Still, calm surface | Clean light entry and a mirror finish, so colour reads deep and even |
| Pine-clad canyon walls | Reflect green light onto the water, strongest near the shaded walls |
| Cold, clear freshwater | Low murk means light penetrates cleanly rather than scattering grey |
| Bright overhead sun | Adds more open-sky blue out in the middle, so the green looks lighter there |
Why the water is cold and clear enough to swim in
A deep reservoir fed from the mountains holds cold water, and Green Canyon is genuinely cold — that is part of the appeal on a hot Antalya day. It is clear too, because it is a controlled dam lake rather than a busy stretch of coast. Our cruises include swimming stops in this cold, clear water, and on many tours a lakeside lunch as well. For the exact stops and what is included on the day, check the tour page — we would rather point you there than promise a fixed swim count that varies by boat and season.
What a day at Green Canyon looks like
It is a full-day trip. There is a hotel transfer to reach the lake, a relaxed cruise across the reservoir, swim stops in the cold water, free time, and a return transfer at the end. Guests are picked up from their hotel in the morning; the exact time is confirmed the day before and varies from hotel to hotel. You book online and pay on the tour day.
Because it is a calm lake, it suits families and anyone who does not get on with choppy sea trips. Ready to plan it? Our Green Canyon boat tour page has the live details for your pickup point.
Prices from each departure point
Prices depend mostly on how far the transfer has to travel. These are approximate 2026 per-person starting prices — the live price is always on the tour page.
| Departure point | From (per person, approx.) |
|---|---|
| Side | from EUR28 |
| Alanya | from EUR38 |
| Kumkoy | from EUR43 |
| Belek | from EUR48 |
| Antalya | from EUR54 |
If you are travelling from further west, the Antalya Green Canyon boat tour and Alanya Green Canyon boat tour pages carry the pricing and transfer detail for those pickups. You can also browse our full fleet and trips if you are comparing options.
Frequently asked questions
Is the water dyed to make it green?
No. There is nothing added to the water. The green comes from natural causes — deep, mineral-rich freshwater that returns green-blue light, plus the reflection of the surrounding pine forest on a still surface.
Is Green Canyon a natural lake?
No, it is a reservoir. The Oymapinar lake was formed in the 1980s when a dam was built on the Manavgat river, flooding a steep canyon valley in the Taurus mountains. The deep, dammed water and tall canyon walls are exactly what give it the green colour.
Will the water look green all day?
It stays green throughout, but the shade shifts. Near the shaded canyon walls the green is deepest, thanks to the forest reflections; out in open sun in the middle of the lake it can look a lighter green-blue as more sky blue mixes in.
Can I swim, and is the water cold?
Yes, our cruises include swimming stops, and the water is cold and clear — it is a deep mountain reservoir. Bring something warm for after your swim. For the specific stops on your trip, see the tour page.
Where can I join the tour from?
Guests join from Side, Manavgat, Kumkoy, Belek, Alanya and Antalya. You are picked up from your hotel in the morning; the exact time is confirmed the day before and varies from hotel to hotel.
See the green for yourself
The colour is genuinely striking, and no photograph quite does the reflections justice — the mirror-flat green really does surround the boat once you are between the canyon walls. Book online and pay on the tour day, with a morning pickup from your hotel. Reserve your place on our Green Canyon boat tour and come and see why the water is so green.