The Ponte a Buriano and Penna Regional Nature Reserve extends for about 7 km along the course of the Arno river, from the Romanesque bridge of Ponte Buriano to the power station located downstream of the ENEL Penna dam, and includes the artificial reservoir of the dam and the surrounding land areas. The landscape is mainly characterized by the gentle hills surrounding the reservoir, made up of fluvio-lacustrine sediments of different ages, with the occasional presence of crags and vertical walls. From the paper mill of Ponte a Buriano as far as Rondine, the Arno flows between the rocks, while from Rondine to Penna the river widens to form the Penna reservoir. The vegetal landscape is made up of downy oak woods, located above all on the slopes directly exposed to the reservoir, a small strip of riparian trees, shrubs, agricultural crops (located above all along the left bank of the Arno) and a vast marshy area in the eastern part of the Reserve.
