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La Pubilla, as the typical fog of the Osona region is known, is shown in all its splendor in this series of photographs in Las Fotos de los Lectores de La Vanguardia captured from Morro de la Trona.
Fog is a very common phenomenon throughout the Plana de Vic, an elongated depression in a north-south direction that constitutes the central nucleus of the Osona region, the area of ​​Spain with the most days (a hundred) of fog per year.
Fog is a meteorological term that refers to the suspension of small water droplets that together form very low clouds, near or at ground level.
La Trona de les Guilleries is one of the most unique rocks in the landscape of this part of Osona, populated by typically Mediterranean oak and cork oak forests on the slopes, and by oak and beech groves in the shade, although both types of forest have been replaced in part by forest crops of pines and chestnut trees.
In the Escull de la Trona there are some abrupt reliefs, in the northwest of the Plana de Vic, which separate it from the Lluçanès plateaus. In these reliefs there are outcrops of Paleogene coral reefs.
