Siena is a provincial capital of central Tuscany and is located on three hills of the eastern slopes of the Colline Metallifere. It is among the most famous artistic centres of Tuscany. The city is known the world over for it‘s artistic patrimony and also the great unity of style in the Medieval buildings of the city center. It has been declared a World Heritage Site by UNESCO. Siena lies at the center of a vast hilly area between the valleys of the Arbia river to the south, the Merse to the south-west and the Elsa to the north, between the Chianti hills to the north-east, the Montagnola to the west and the Crete Senesi to the south-east.