The Po River basin is the largest Italian basin, covering an area of 74 000 km2 (70 000 km2 in Italy, 4 000 km2 in Switzerland and France). The Po crosses the northern part of Italy for over 650 km and discharges its water into the Northern Adriatic Sea at an average 1 470 m3/s. Its delta, covering about 380 km2, is regarded as one of the most complex estuarine systems in Europe.

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