It covers an area of approximately 1Km along the old railway.
The longer route starts from the path near the recreational
area situated at the entrance to the gorge and ends at the
starting point. First, it goes up to the Nature Reserve of
Acantilados de la Piedra and San Martín, and then goes
down to the river banks before reaching the path along the
old railway. This route is approximately 5 Km long.
The vegetation indigenous to the area includes
willows near the river, and poplars, willows, black poplars
and elms at the entrance and exit from the gorge. In the
cracks of rocks grow some interesting species such as the
"Saxifraga cuneata", "Erinus alpinus"
and "Petrocoptis pyrenaica".
The fauna of the area includes an important
community of vultures, made up of fifty couples. "Corvus
spp.", Egyptian vultures, swifts and owls can also
be found. The river is home to otters.
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