Surrounded by Vulsini and Cimini mountains (north) and crossed by Tevere River, it is Lazio’s second province size-wise (3,612 square kilometers), but has a small population (281,244). It is separated from Rome’s province by Sabatini Mountains, while the southern part, which is flat, is called Maremma. The population is concentrated on the coast, especially in Montalto di Castro. Other than Viterbo, other towns are worth visiting such as Tarquinia, Civita Castellana and Bolsena, which are a tourist target in the summer. The province’s lakes play the same role. Bolsena Lake is the region’s largest and fifth in the country and the largest volcanic lake. The second most important is Vico Lake. Others are not very famous but worth seeing, for example Mezzano lake with its half-submerged town.