The Lambro rises from the Monte San Primo, elevation 1,685 metres , near the Ghisallo, in the province of Como, not far from Lake Como. After Magreglio it flows through the Valassina and the comuni of Asso, Ponte Lambro and Erba, entering Lake Pusiano with the name of Lambrone. The Lambro passes through Brianza reaching Monza and crossing its famous park in two branches which join again before the river passes through the eastern part of Milan. At Melegnano it receives the waters of the Vettabbia and, at Sant'Angelo Lodigiano, those of its main tributary, the Lambro meridionale , almost doubling its discharge. The Lambro flows into the Po near Orio Litta.
At 5.8 cubic metres per second the average discharge of the Lambro is relatively small, but it can be occasionally boosted to 40 m³/s or more by the Milanese water drains and dangerous floods are frequent in the rainy seasons.
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