page_title: Lake Bolsena
section_title: Comuni bordering the lake
hierarchical_section_title: Lake Bolsena / Comuni bordering the lake
caption_attribution_description: Italiano: Lago di Bolsena al tramonto - Foto di Maurizio Firmani, concessa dall'Autore - http://www.emmeeffe.org/ English: Sunset over Lake Bolsena photo by permission of Maurizio Firmani, http://www.emmeeffe.org/ Deutsch: Bolsenasee
context_page_description: Lake Bolsena of central Italy, is a lake 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. A sewage treatment plant filters most of the raw sewage from the surrounding communities. Constructed in 1996, it features pipelines transporting the sewage from every major community around the lake to the treatment plant on the Marta River; that is, no effluents enter the lake. Fertilizers are a second source of contamination. However, the chemical content of the lake is monitored at several stations around it.
  Lying within the northern part of the province of Viterbo that is called Alto Lazio or Tuscia, the lake has a long historic tradition.
context_section_description: The following comuni are situated on the shore of Lake Bolsena:
  Bolsena
  Montefiascone
  Marta
  Capodimonte
  Valentano
  Gradoli
  Grotte di Castro
  San Lorenzo Nuovo
  Each has a designated length of beach for summer swimming. Some of these have facilities such as cafés, restaurants and boat rentals.
  Other nearby towns are Sorano, Pitigliano, Acquapendente and Orvieto, with Onano to the northwest.
caption: Sunset over Lake Bolsena
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