Lac Bleu via the Col d'Aoube from the Toue bend

Date of walk : Sep 13, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

Hike completed at the end of August 2025.
The route is very well marked.
No particular difficulties.
The arrival at the green lake and then the blue lake is magnificent.

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Date of walk : Sep 07, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★☆ Good
Busy trail : Yes

I did this hike on Saturday, 6 September.
The route is very well marked.
Caution is advised for those prone to vertigo at the start of the hike. There are narrow, rocky passages along the mountainside.
No difficulties thereafter. The Col d'Aoube is easy to cross on the way there and back.
The arrival at the green lake and then the blue lake is magnificent.
On that day, the lakes were a sublime colour.

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Date of walk : Aug 24, 2025
Reliability of the description : ★★☆☆☆ Disappointing
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : No

The race classification is incorrect. The hike is not "difficult". It should be classified in the Walker/Hiker category - No particular difficulty.

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Date of walk : Aug 17, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes

Setting off alone early in the morning, I saw the sun rise over the Aoube Pass, surrounded by a silent, rocky landscape – a truly memorable experience. On the other side of the pass, as I was well on my way down towards the green and blue lakes, I had to turn back and climb back up because there was a herd of patou and I didn't want to disturb them. Another herd was present at Lake Aouda, which was dry, but there were no patou. It should be noted that there is a tricky passage, in my opinion, when bypassing Bonida. Thank you for posting the route online.

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Date of walk : Jul 25, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

We did this hike in 4 hours and 40 minutes round trip. The path is accessible to everyone. Of course, there are small stones, but nothing too serious. I find the path particularly pleasant and not dangerous at all. In addition, there is a 400-metre elevation gain
on the way there, which is manageable, and another 300 m elevation gain on the way back. At the end, there is a very large, beautiful lake with a lovely view. We did this hike on a day when it wasn't very sunny. If you want to do it on a very hot day, set off early as there is very little shade. Please note that there is no water on the route.

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Date of walk : Jun 29, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Busy trail : No

A beautiful hike in June. We left early to find a parking spot in the bend, especially because it was already extremely hot by 11 a.m. There were a few technical and narrow sections just after the start. The blue lake and green lake are pretty but you have to work for them... While the descent and climb back up to the lake are pleasant, the path from the car park to the pass is, in my opinion, very unpleasant... There are rocks everywhere and the stony finish kills your legs and knees...

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Date of walk : Aug 22, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Busy trail : Yes

A blue lake that lives up to its name thanks to its beautiful colour. Nice, with a lovely view, especially as the hike is fairly easy overall. But personally, I prefer hikes where I can find vegetation, trees or mineral elements, such as rocks and/or other natural features... here, from start to finish, it's more like a bare mountain... a single tree above the lake... everything else is sheep pasture and pebbles...

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Date of walk : Aug 25, 2024
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : Yes

Good, but the maps do not remain zoomed in

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Date of walk : Aug 04, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : No

Good description, easy to use

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Date of walk : Jul 04, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

2,369 m 3 magnificent lakes: Bleu, Vert & Oncet - Pic du Midi #hautespyrenees
Lac Bleu with an intense colour never seen before :-o Lac Vert and Lac d'Oncet beneath the Pic du Midi ;-)

A superb hike to Lac Bleu & Lac Vert and a wind strong enough to mess up your hairstyle :-)
A round trip... then a detour to Lac d'Oncet below the Pic du Midi ;-)
There are few parking spaces in the bend: it's best to arrive early because people usually go straight to Lac d'Oncet for a dip, especially if it's hot.
The start of the hike is quite challenging, with mini climbs and descents on a narrow path covered with rocks in these sections. It's best to take it easy.
Superb panoramic views throughout the hike!
The climb to the Col d'Aoube isn't super easy because the path has been carved out of a landslide. But as you continue along, there are only small rocks and the terrain is fairly easy and flat.
On the other hand, it's still a climb ;-)
There is a beautiful descent to the two lakes afterwards. A descent that you will have to climb back up...
People tend to start from the Lesponne valley to see these two lakes because the addition of Lac d'Oncet presents a few more difficulties :-o
I found the climb to Lake Oncet easier than the part where you have to make up for this climb, which is full of rocks and pebbles, so it's tiring!
Once at the top, there is a significant but easy descent, followed by a short climb to discover Lake Oncet and the Pic du Midi.
In the end, I climbed higher to get a beautiful view of the lake and the Pic du Midi.
It takes a bit of extra effort, but it's worth it.
We then descend back to the car park on a path that is much easier to walk on than the alternating ups and downs at the start of the hike :-)
⚡️ Highlights of the hike:
- Barèges Col du Tourmalet
- Altitude 1,960 m - Lac Bleu
- Altitude 1,950 m - Lac Vert
- Altitude 2,260 m - Lac d'Oncet
- Altitude 2,369 m - Col d'Aoube
- Lesponne Valley.

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Date of walk : Jul 21, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

Nice hike, beautiful scenery, gorgeous blue lake.
A few marmots. Several flocks of sheep.
About 5½ hours round trip, at a fairly leisurely pace.
At the start, there are some ledge paths that may be a little tricky for those who are afraid of heights (but still acceptable).
A few hikers along the way.
Highly recommended!

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Date of walk : Jun 30, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

We drove to the edge of the lake for lunch.

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Date of walk : Aug 23, 2023
Reliability of the description : ★★★★★ Very good
Clarity of route map : N/A
Route interest : ★★★★★ Very good
Busy trail : No

A very beautiful route. Only one technical section near the start.
After the Col d'Aoube, it's time to meet the marmots
I set off late, around 8:30 a.m. The route is still fairly quiet.
The arrival above Lac Bleu is simply magnificent

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Date of walk : Jul 15, 2023
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes

A very beautiful hike. However, the start of the hike, along the hillside on a narrow and sometimes slightly technical trail, may pose problems for hikers who are prone to vertigo (over 1 km, between the junction with the GR10 and the entrance to the Aouda valley).
To reach the shores of the blue lake, add 500 metres and 90 metres of elevation gain to the description provided.
Sheep and a few marmots were encountered along the route

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Date of walk : Aug 11, 2022
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes

Even though climate issues have drained half of Lac Bleu, what remains is still blue, and this way of discovering it is much more peaceful and interesting than the routes from Chiroulet: watching the shepherds at work with a flock of around a hundred sheep, for example, or military helicopter exercises today
In any case, to see the "blue" lake, you have to view it from a little higher up.

I would just like to add one thing: the first part, from the junction with the GR 10C, is on a ledge and can present subjective or objective dangers, especially when you consider that during the holiday season the path is used by a very diverse group of people who are not necessarily very good at dealing with the effects of "vertigo".

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