The forest of about 580 hectares is what remains of the ancient Silva Mantiana, which once covered much of northern Lazio. The dominant tree species are the century-old oaks, for which Macchia Grande is famous. Rich is also the undergrowth, consisting of plants such as ferns, wild roses, butcher's broom, holly and different types of flowers, in addition to a large variety of mushrooms, some of which are edible. Wildlife is made up of foxes, martens, weasels, woodcocks, woodpeckers, buzzards and other birds. The Forest of Manziana is perfect for undemanding hiking and mountain biking.