Province of Viterbo

The Province of Viterbo () is a province in the Lazio region of Central Italy. Its capital is the city of Viterbo.
The province is also called "Tuscia".
History.
The province of Viterbo was created in January of 1927 with part of the old "Province of Rome". In March of the same, the comune of Monte Romano.
In 1928, five "comuni" were added: Montalto di Castro, Monterosi, Nepi, Oriolo Romano and Tarquinia.
Geography.
The province of Viterbo has an area of , making it the second largest province of the Lazio region.
The province is bordered to the northwest with Tuscany (Grosseto and Siena provinces), to the northeast with Umbria (Terni province), to the east with the Rieti province and to the south with Rome. The Tyrrhenian Sea is to the west.
The province is in the northwest of the Lazio region. Most of the territory of the province is flat or with small hills. The highest mountain in the province is Monte Cimino (), in the southern part of the province, with an altitude of .
The main river in the province is the Tiber that forms the border between the Umbria (province of Terni) and Lazio (province of Viterbo) regions.
There are several lakes; the largest is the Bolsena lake with an area of .
Administration.
The following shows the "comuni" of the province with more of 9,000 people living in them (1 January 2017).
The largest "comune" is Viterbo, with and the two smallest are Calcata () and Villa San Giovanni in Tuscia (). The "comune" with fewest people living in it is Tessennano with 339 inhabitants.
Population.
In 2017, there are 319,008 persons living in the province, for a population density of inhabitants/km².
Evolution of the population in the Viterbo province