the Dachstein in the middle of the photo, as that is 30 km/20 miles away from the Attersee. It is hard to identify the snowy mountains in the distance, though.
Thanks for the rectification :)
I based my legend on few pictures captions I found here and there with Google, but to be sure we would need a map, and I don't know where to find such map on internet ...
You might try Google Earth or Google Maps!
corrected ! :)