In 1996, the Provincial Administration of Siena established 11 Nature Reserves covering about 8 thousand hectares of territory with a high environmental, naturalistic, historical, and cultural value, whose different protected environments house rare animal and vegetal species of great scientific and conservation interest. The 11 Nature Reserves form a System of Protected Areas whose aim is to ensure and promote, in a coordinated manner, the conservation and enhancement of the environment, the landscape, the historical-cultural and naturalistic heritage.