the "cross" formed by the union of the three basins. Lakes Within the province there are eight lakes. The main lake basin, in both dimensional, climatic and cultural terms, is Lake Garda, shared with the Veneto and Trentino regions, which with its 370 km² of surface is the biggest lake in Italy. Because of its size, the lake has a considerable influence on the climate and the surrounding environment, generating a micro-geographic area in a more mitigated climate both in summer and winter. Lake Iseo is the second lake of the area, and is situated at about 180 m above sea level, in an area called Sebino, between Val Camonica (north) and Franciacorta (south), which divides the provinces of Bergamo and Brescia. Lake Idro, the third lake within the provincial territory, is located in Valle Sabbia, on the border between Brescia and the province of Trento, and differs from the other two main lakes for its modest size. The waters of the lake are mainly exploited for the irrigation of crops in contiguous territories, as well as for the production of energy through a small power plant located in the municipality of Vobarno. Other small lakes in the province are: Lago della Vacca (at an elevation of 2,358 m, in one of the coldest points of the province), Lago d'Arno, Lago Aviolo, Lago Baitone, Lago Moro and Lago di Valvestino. Rivers There are about 45 watercourses crossing the territory of the province, but almost all of them are torrents. The only watercourses that can be defined as real rivers are just three: Oglio, Chiese and Mella; divided between the three main valleys. Extreme points Highest point: Mount Adamello, Saviore dell'Adamello (3,539 m) Highest settlement: Tonale Pass, Ponte di Legno (1,883 m) Northernmost municipality: Ponte di Legno Southernmost municipality: Fiesse Easternmost municipality: Limone sul Garda Westernmost municipality: Pontoglio Main sights UNESCO World Heritage Sites Rock Drawings in Valcamonica; Brescia, one of the places of Longobard power; Prehistoric settlements of Lavagnone (Desenzano del Garda), Lugana Vecchia (Sirmione), Lucone (Polpenazze del Garda), San Sivino and Gabbiano (Manerba del Garda). Castles and fortress Castle of Brescia; Castle of Sirmione; Castle of Lonato; Bonoris Castle; Castle of Desenzano; Castle of Breno; Fortress of Anfo; Castle of Padenghe; Castle of Padernello; Castle of Pozzolengo; Castle of Carzago; Castle of Bornato; Castle of Drugolo. Other sights Lake Garda, Lake Iseo and Lake Idro; Stelvio National Park; Adamello