kerlingarfjoll mountain range on geothermal area and sulphur smoke in summer at iceland

adventure attraction beautiful brown crater destination difficulty earth environment exploration famous place field geology geothermal highland hiking hill hveradalir iceland icelandic highlands journey kerlingarfjloll landmark landscape majestic mountain range nature ridge rock rural scenery scenic season smoke snow steam stone sulphur summer terrain tourism travel trip valley view volcanic volcano wilderness kerlingarfjoll area trail