Buenos Aires Province

Buenos Aires Province fronts the South Atlantic on Argentina's mid-latitude coast from the Río de la Plata estuary at the northern edge south through Pinamar and Mar del Plata to the deepwater port at Quequén and on toward Patagonia. The tide signature here is moderate semidiurnal at the open-coast resorts and considerably larger at the river-mouth gauge in the Plata. Mean range at Mar del Plata is about 0.9 metres, climbing past 1.4 metres on the largest spring tides and dropping near 0.5 on neaps; the Plata estuary at Buenos Aires runs a smaller astronomical signal that the southerly sudestada wind events override completely, lifting water levels three to four metres above predicted in extreme cases. The pattern at Mar del Plata is two highs and two lows about twelve and a half hours apart, and the city's long Atlantic-facing beach corridor — Bristol, Playa Grande, Varese — widens by tens of metres at low water. The defining seasonal force is the southerly pampero front that sweeps up off Patagonia and the deeper sudestada that develops when a coastal low draws south-east winds across the long fetch of the South Atlantic. Quequén on the Necochea side amplifies surge events through its working port geometry. Sportfishing fleets out of the Mar del Plata harbour, the surf breaks at Cabo Corrientes and Playa Grande, the wide sand at Pinamar and Cariló, and the sealing colony on the harbour breakwater all read the table for different windows. The Servicio de Hidrografía Naval publishes the authoritative Argentine tide tables; Open-Meteo Marine drives the gridded predictions on this site.