Located 180km from the French border on the Mediterranean coast, Barcelona is a dense city, dominated by the Collserola mountain and set among the hills of the plain bounded by the mouths of the Besòs and Llobregat rivers. Capital of Catalonia, it is divided into 10 districts and enjoys a Mediterranean climate in a region sheltered from westerly winds by the Pyrenees. Although often sunny, its position between sea and mountains can encourage foggy spells during the autumn and in early spring. Summers there are hot, though tempered by the closeness of the sea. Winters, for their part, are generally sunny and relatively mild despite occasionally cool winds.