Editing Adda (river) (section)

==Course ==
The Adda's source is in the Alpisella valley near the head of the Fraele glen, within the [[Rhaetian Alps]].<ref name="OpenStreetMap"/>  Its flow is augmented by several smaller streams near [[Bormio]].  From there, it flows southwest, then west, through the [[Valtellina]], passing [[Tirano]], where the [[Poschiavino]] joins from the right, and [[Sondrio]], where the [[Mallero]] joins, also from the right. This section of the Adda's course is unusual in Northern Italy, as it flows from east to west.  The river flows into the northern end of Lake [[Como]], contributing significantly to the lake's volume.  Exiting the lake's southeastern (Lecco) arm, it crosses the Lombardy Plain.  It receives water from the [[Brembo River|Brembo]] and [[Serio River|Serio]] from the left, and ultimately joins the [[Po River|Po]].<ref name="EB1911">{{EB1911|inline=1|wstitle=Adda|volume=1|last= Coolidge |first= William Augustus Brevoort |author-link= W. A. B. Coolidge|page=183}}</ref>

The [[Trezzo sull'Adda Bridge]], constructed in 1377, had a single arch of {{convert|72|m|ft}}, the longest bridge arch built before the introduction of metal in bridge construction.<ref name="Whitney1929">{{cite book |last=Whitney |first=Charles S. |title=Bridges of the World: Their Design and Construction |publisher=Courier Dover Publications |year=2003 |orig-year=1929 |isbn=9780486429953 |page=137}}</ref>

The lower course of the Adda historically marked the border between the [[Republic of Venice]] and the [[Duchy of Milan]], as established by the [[Treaty of Lodi]] in 1454.  Several significant battles have been fought along its banks, including the [[Battle of Lodi]] in 1796, where [[Napoleon]] defeated Austrian forces.<ref name="EB1911"/>  The bridgehead at [[Cassano d'Adda]] and its surrounding area have also been the site of multiple battles, including one in 1705 involving [[Prince Eugene of Savoy]] and the French, and another in 1799 where [[Alexander Suvorov]] led his forces across the river.<ref name="EB1911"/>