This is a view from the hill above Olsina across to the Sumava National Park. One clear days, such as those you can get in Winter, one can see for miles. Look closer and you will see a blue line on the horizon. Obviously it was much more noticeable from the hill, so here is a zoom photograph to show just what you would have seen:
Yes, they are mountains - the Alps to be precise. As you come south through South Bohemia you begin to rise, until in the Sumava you are in the foothills of the Alps, which means great air quality and great skiing.
