In the past two years, the Paraná River, the second-longest in South America and traversing Paraguay, Argentina, and Brazil, has been experiencing its lowest water levels in 77 years (Naumann et al., 2021). In 2021, the Rio Paraná flow rate significantly reduced from an average of 17,000 to 6,200 cubic meters per second. The deficit is well visible in the image acquired by the Copernicus Sentinel-2 on 27 November 2021, showing the low flows in the Paraná River near Corrientes in Argentina (Figure 1). At the time of image acquisition, the level of the Paraná River in Corrientes was 2.64 meters below the monthly November average (based on the last 25 years).
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