Lago di Terlago is a large and shallow hill lake, situated on the bottom of the hollow of the same name, which derives from the presence of three bodies of water, connected with one another, that used to surround the ancient village. Today, partly because of agricultural reclamation, only two of them remain; their connecting stretch is crossed by a road bridge. The area has changing environments, and its vegetation is especially interesting, since wetlands in thermophile areas have generally declined. The lush water vegetation, the flora on the lake shores, and the dry grasslands around the lake, where many Orchidaceae grow, are especially remarkable. The place is also important as nesting, rest, and wintering ground for protected or declining bird species, to be found only in certain areas on the Alps.