Italy's longest river runs dry as drought threatens dairy heartland

Italy's Po River, which flows across the northern plain from the Alps toward the Adriatic, is running dry as the heatwave intensifies, according to reporting from The Local Italy. The waterway is experiencing seawater intrusion—salt water moving inland from the sea as freshwater supply collapses—a sign of severe drought stress in a region that anchors Italian agriculture. The Po valley produces the milk that supplies Parmesan cheese production, one of Italy's most valuable agricultural exports.

The crisis reflects a broader pattern. European scientists cited by international outlets have confirmed that human-caused climate change is "unequivocally" responsible for the intensity of the current record-breaking heatwave. The Po's collapse is not an isolated weather event but a symptom of structural climate stress affecting the continent's water systems. The valley's farms depend on reliable irrigation and river flow; as both fail simultaneously, the economic and food-security consequences ripple outward.

For the Valle d'Aosta, the Po's crisis carries an indirect but significant message. The region sits upstream in the Alpine chain that feeds the Po and other major northern rivers. If drought stress is severe enough to cause seawater intrusion in the lowlands, it signals that Alpine water supplies—the source of the region's hydroelectric power and cross-border water sales—are under unprecedented strain. The cascade of water demand from agriculture, energy generation, and municipal use means that mountain water is no longer a surplus resource but a contested one.