Global Volcanism Program | Image GVP-01506
The 16-km-wide Bolsena caldera containing Lago di Bolsena, is the most prominent feature of the Vulsini volcanic complex NW of Rome. The 2,000 km2 volcanic complex also includes the Latera caldera to the west. Both calderas were formed during the Pleistocene. Post-caldera eruptions produced scoria cones, lava flows, and youthful-looking cones that form islands in Lago di Bolsena.
Photo by Richard Waitt, 1985 (U.S. Geological Survey).