Lake Bolsena

Lake Bolsena (Italian: Lago di Bolsena) is a crater lake of central Italy, of volcanic origin, which began to collect 370,000 years ago following the formation of a caldera in the Vulsini volcanic complex. 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 caldera.

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.

Bolsena

Bolsena is a town and comune of Italy, in the province of Viterbo in northern Lazio on the eastern shore of Lake Bolsena. It is 10 km (6 mi) north-north west of Montefiascone and 36 km (22 mi) north-west of Viterbo. The ancient Via Cassia, today's highway SR143, follows the lake shore for some distance, passing through Bolsena.

History

While it is fairly certain that the city is the successor to the ancient Roman town of Volsinii (sometimes termed Volsinii Novi – New Volsinii – to distinguish it from the Etruscan city), scholarly opinion is sharply divided as to whether Volsinii was the same as the ancient Etruscan city of Velzna or Velsuna (sometimes termed Volsinii Veteres – Old Volsinii), the other candidate being Orvieto, 20 km (12 mi) NE. George Dennis pointed out that the town of Bolsena has no Etruscan characteristics; for example, Etruscan cities were built on defensible crags, which the hill on which the castle is situated is not. The Roman historian Pliny the Elder said that a bolt from Mars fell on Bolsena, "the richest town in Tuscany" and that the city was entirely burned up by this bolt. The population moved to another site, which Dennis thought was Bolsena. The new city was named after the old, hence Roman Bolsena has an Etruscan name. Dennis suggests a number of crags in the area including Orvieto but does not favor Orvieto on the grounds that it is too far away.

Bolsena (disambiguation)

Bolsena can refer to the following items:

See also