This nice core of the earth retains Biescas good examples of the architecture of the area. The church of San MartÃn is one of the most beautiful in the path of serrablo , constituting a clear example of Romanesque Aragon . Oliván is located at the entrance of Sobrepuerto , area between the rivers Gallego and Ara whose nuclei are currently uninhabited , with a rich landscape and natural.
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