Lake Garda. Lake Garda is the largest lake in Italy. It is a popular holiday location in northern Italy, about halfway between Brescia and Verona, and between Venice and Milan on the edge of the Dolomites. Glaciers formed this alpine region at the end of the last Ice Age. The lake and its shoreline are divided between the provinces of Verona, Brescia, and Trento. The name Garda, which the lake has been seen referred to in documents dating to the eighth century, comes from the town of the same name. It is the evolution of the Germanic word warda, meaning place of guard or place of observation. The northern part of the lake is narrower, surrounded by mountains, the majority of which belong to the Gruppo del Baldo. The shape is typical of a moraine valley, probably having been formed under the action of a Paleolithic glacier. Although traces of the glacier's actions are evident today, in more recent years it has been hypothesised that the glacier occupied a previously existing depression, created by stream erosion 5 to 6 million years ago. The lake has numerous small islands and five main ones, the largest being Isola del Garda where in 1220 St. Francis of Assisi founded a monastery, in its place now stands a nineteenth-century building in the Venetian Gothic style. Nearby to the south is Isola San Biagio, also known as the Isola dei Conigli. Both are offshore of San Felice del Benaco, on the lake's western side. The three other main islands are Isola dell'Olivo, Isola di Sogno, and Isola di Trimelone, all farther north near the eastern side. The main tributary is the Sarca River, others include the Ponale River, the Varone / Magnone River and various streams from both mountain sides, while the only outlet is the Mincio River. The subdivision is created by the presence of a fault submerged between Sirmione and Punta San Vigilio which is almost a natural barrier that hampers the homogenization between the water of the two zones. If the water level of the Adige river is too high, excess water is diverted to the lake through the Mori-Torbole tunnel. The particularly mild climate favours the growth of some Mediterranean plants, including the olive tree. Citrus trees can also be found, which are extremely rare at this latitude.This greatly favoured the development of tourism since the end of the second world war. In ancient times, poets like Catullus wrote about Lacus Benacus with its mild climate vivified by the winds. The lake is oriented from north to south towards the Po Valley, so many winds typical of the lake are the result of a difference between lower and higher altitude temperatures. Due to this, winds are generated that descend from the mountains to the plains in the morning and go back to the mountains in the afternoon. The bottleneck formed by the lake basin affects the timing of the winds, many of which happen on a regular daily basis. The winds are all named, most in regional Italian dialect so a single wind may have different names. Salmo carpio, also known as the carpione is a rare salmonid fish endemic to Lake Garda. It has been introduced to a number of other lakes in Italy and elsewhere but unsuccessfully in all cases. The population in Lake Garda has been strongly declining, and is considered critically endangered. The main threats are due to overfishing, pollution and possibly competition from introduced species such as Coregonus and other Salmonidae. Adult lake trout outside the mating season are silvery with very few black spots on the body and almost none on the head. During the mating season males develop some a dark mottled body coloration. Garda lake trout reach a length of up to 50 centimeters. They live primarily in depths of 100 to 200 metres. They feed on zooplankton and bottom-dwelling crustaceans in summer. Males and females reach sexual maturity at two or three years. The mating takes place every one to two years. The spawning takes place in 50 to 300 metres depth in the vicinity of underwater springs. The maximum age is five years. Battle of Lake Benacus, in which Roman forces defeated the Alamanni on the shores of Lake Garda, in the year 268. Battle between Milan and Venetian Republic in 1438 following the military engineering feat of galeas per montes. Battle of Rivoli, in 1797 during the French campaign of Napoleon I in Italy against Austria. Battle of Solferino in 1859, during the Italian Risorgimento.