Salty seawater has advanced 18 km (11 miles) inland along Italy's Po River as a severe heatwave reduced water flow [1].
This intrusion threatens the stability of the Po Delta, where farmers rely on the river for irrigation, and protected wetlands provide critical ecological services. The salt contamination can ruin crops and permanently alter the soil chemistry of the region.
The drop in water levels occurred rapidly, with flow decreasing significantly in less than two weeks [1]. This sudden decline is attributed to a severe European heatwave that created intense drought conditions across the region [1].
The seawater push is most evident near Porto Tolle, where the river meets the Adriatic Sea. Because the outward pressure of the river's freshwater has diminished, the sea is able to push further upstream — a process that endangers the local agricultural economy.
Environmentalists and farmers in the Po Valley are monitoring the situation as the heatwave persists. The balance between freshwater outflow and saltwater intrusion is delicate, and the current deficit puts the Po Delta's unique biodiversity at risk [1].
Reports from June 27, 2024, highlight the urgency of the crisis as the river's flow continues to struggle against the heat [1]. The phenomenon underscores the vulnerability of Italy's longest river to extreme weather events and prolonged temperature spikes.
“Salty seawater has advanced 18 km (11 miles) inland along Italy's Po River”
The saltwater intrusion in the Po River illustrates the direct link between extreme heat and food security. When river flows drop below a critical threshold, the sea encroaches on freshwater sources, creating a 'salt wedge' that can render agricultural land infertile for years. This event highlights the increasing frequency of climate-driven hydrological crises in Southern Europe.
