Can you ask around others who use that garbage bin? I presume it was something like an office bin, not a public bin or dumpster you were trawling through.
@Willeke "I found this picture in a garbage bin and now I want to go there" feels very stalkery to me, or at least enough of a risk of being so that we should err on the side of closing unanswered
I don't have enough reputation to vote as to close or leave open to this question. However, if I had, I would leave it open as it is interesting. I don't know where it is, I have guesses though which include Iceland and New Zealand. Hope someone knows.
@WeatherVane actually, it was in a public dumpster where I was throwing my own garbage (recyclable waste is thrown without bags in France where I live), so I cannot decently ask the people around
I would have thought, living in France, that in might be in the Alps (there aren't enough other mountains high enough around here to have this kind of glacier lake), but it might be from further away indeed.
Given the glacier tongue in the top left and that the picture looks a couple of decades old, the lake will likely be larger and in a different shape today, thanks to climate change and melting glaciers.
I don't (yet) know where it is in the world, but you can narrow it down a little as being somewhere that people visit regularly - there is a road or track in the top right of the image, to the left of the two pale stripes. It's either a drone/balloon camera photo or a satellite photo taken late afternoon and probably in the last 20 years from the retreating glacier (stone coloured on top = melting). Lowish altitude as trees. Lake might be longer now, but terminal moraine shape and lake edge on right hand side won't have changed much.
@uhoh plus there are lumps of ice on the lake - these are the high albedo objects in the water, particularly the big one near the left-end of the lake. It's high altitude or somewhere cold - there's snow on the ground in the left of the picture. I also don't know of any volcanic lakes that have a water exit that isn't also the one the lava came out of - lowest point and all. Presuming that the thing I labeled as glacier is a hardened lava flow.