Adda river

Adda
The Adda in Tirano
Location of the Adda in Italy
Countries	Italy, Switzerland
Basin features
Main source	Val Alpisella (Stelvio Pass), Italy 2,237 m (7,339 ft)
River mouth	Po River
Basin size	7,979 km2 (3,081 sq mi)
Physical characteristics
Length	313 km (194 mi)
Discharge	Average rate: 187 m3/s (6,600 cu ft/s)

The Adda (Latin Abdua, or Addua; in Lombard Ada or, again, Adda in local dialects where the double consonants are marked) is a river in North Italy, a tributary of the Po. It rises in the Alps near the border with Switzerland and flows through Lake Como. The Adda joins the Po a few kilometres upstream of Cremona. It is 313 kilometres (194 mi) long. The highest point of the drainage basin is the summit of la Spedla (a subpeak of Piz Bernina), at 4,020 metres (13,190 ft).

Towns along the river Adda include Bormio, Sondrio, Bellagio and Lecco (both on Lake Como), and Lodi.

The Adda's true source is in some lakes near the head of the Fragile glen, but its volume is increased by the union with several smaller streams, near the town of Bormio, at the Raetian Alps. Thence it flows first southwest, then due west, through the fertile Valtellina, passing Tirano, where the Poschiavino falls in on the right bank, and Sondrio, where is the junction with the Mallero, also on the right. This first half path of Adda makes it the very only one big river of Northern Italy to flow from East to West. It falls into the Lake of Como, at its northern end, and mainly forms that lake. On issuing from its southeastern or Lecco arm, it crosses the plain of Lombardy where it is joined from the left by the Brembo, Serio, and finally, after a course of about 240 kilometres (150 mi), joins the Po, 13 kilometres (8 mi) above Cremona.