the big lagoon in the sierra de gredos, avila, spain.

mountain wilderness lake valley landscape geology plateau ridge fell nature wadi walking rock adventure big lagoon sierra gredos avila spain ridge natural park daytime slope hiking trail high glacier almanzor shore refuge blue valley natural mountaineering mountains beautiful trekking background sky water europe lake peak landscape avila adventure castilla leon circo gredos destination environment hiking hill mountain nature outdoor recreation rock scenery scenic spain stone summer sunny tourism travel vacation view