thur river canyon without water during summer drought die schlucht des flusses thur in the obertoggenburg region, unterwasser

adventure alpine alps altitude attraction autumn background beautiful canton canyon climate climb colorful des die drainage drought extreme flusses gallen geology grassy green high highland highlands hiking hill hydropower journey landscape magnificent minerals mountain mountains natural nature obertoggenburg outdoor outdoors peaks picturesque region river route scene scenery scenic schlucht season spring summer switzerland thur travel tree trekking trip unterwasser vacation valley view wall water wildflowers