The Bolsena lake was formed over 300,000 years ago following the collapse of the caldera volcanoes belonging to the chain of Volsini. It is the largest volcanic lake in Europe. Has a total area of 113.5 km² (fifth in Italy), has two islands, Bisentina the largest one with an area of 17 hm² and can be circumnavigated with the tourist boats that depart from the port of Bolsena and Capodimonte, and Martana, the smaller of the two islands in the lake, in terms of area, with its 10.3 hm².
The lake overlooks pretty and picturesque villages such as Bolsena, Montafiascone, Capodimonte and Martha, all worth visiting for their historic centers perfectly preserved and their significant monuments.
The beaches allow toning swims and sunbathing.