Lake Bolsena (Italian: Lago di Bolsena) of central Italy end.with field of poppies looking south. The lake is of volcanic and tectonic origin. It is the largest volcanic lake in Europe. Roman historic records indicate activity of the Vulsini volcano occurred as recently as 104 BC; it has been dormant since then. The two islands in the southern part of the lake were formed by underwater eruptions following the collapse that created the depression.

The lake is supplied entirely from the aquifer, rainfall and runoff, with one outlet at the southern end.with field of poppies looking south. Max. length13 km (8.1 mi)[2]
Max. width11 km (6.8 mi)
Surface area113.5 km2 (43.8 sq mi)
Average depth81 m (266 ft)
Max. depth151 m (495 ft)
Water volume9.2 km3 (3.2×1011 cu ft.