I was going to say New Zealand...
the most famous Crater Lake is in Oregan, but it isn't yellow.. however it does have Pine trees around it..
The NZ Crater lake is yellow, but it doesn't have pine trees. I don't use the pics to try to see where they come from, as you remember, you even told me how to do it once, and i still couldn't retrieve it.
I will keep searching, but at this point, i will say NZ until i find something else, that would be the stinky one at Rotorua
or Waiotapu NZ Sulphur Lake (this is the correct one.. even matches with the pine trees)