Scientist said Monday that they have found thousands of dinosaur footprints in the Stelvio National Park in northern Italy.

The footprints were left behind about 210 million years ago by herds of large herbivores, according to the Lombardy regional government and Milan Museum of Natural History palaeontologist Cristiano Dal Sasso.

"It is a real 'dinosaur valley' that stretches for kilometres," Dal Sasso said.

"It is the largest (such) site in the Alps and one of the richest in the world".