Correction: La Pasta Cordeiro et al. Tracing the Origin of Groundwater Salinization in Multilayered Coastal Aquifers Using Geochemical Tracers. Water 2026, 18, 252

In the original publication [1], there were errors in Figures 6 and 9. The mistake in Figure 6 does not affect the data or the concentrations used to generate the image, only the convention used to plot the Stiff diagrams. The concentration of all ions is correct and remains unchanged. In the published version, the arrangement of cations and anions in the image was not correct. The legend showed Na⁺ + K⁺ opposite to HCO₃⁻ + CO₃⁻, Ca²⁺ opposite to SO₄²⁻, and Mg²⁺ opposite to Cl⁻, which does not follow the usual Stiff diagram convention. According to the standard representation, Na⁺ + K⁺ should be plotted opposite to Cl⁻, Ca²⁺ opposite to HCO₃⁻ + CO₃²⁻, and Mg²⁺ opposite to SO₄²⁻. Furthermore, in the original version of the manuscript, a typographical error was identified in the representation of the ionic charge of the carbonate ion in Figure 6, incorrectly indicated as CO₃⁻. The corrected notation is CO₃²⁻. The plotting arrangement of the ions and typographical error in CO₃²⁻ ion were corrected while preserving the ionic concentrations in the original figure. The legend of the figure was not altered. In the published version of Figure 9c, the y-axis label read “Cl⁻/Br⁻” instead of “m Cl⁻/Br⁻”. This omission is a typographical error that does not affect the original data or calculations but could lead to misinterpretation of the units. Therefore, the label was corrected to “m Cl⁻/Br⁻” in the revised Figure 9c to improve accuracy and maintain consistency with the other subfigures, namely Figure 9a,b. The legend of the figure was not altered. The corrected Figure 6 and Figure 9 appear below.

The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.

Figure 6. Stiff diagram for the groundwater samples in the springs, confined aquifer and unconfined aquifer.

Figure 6. Stiff diagram for the groundwater samples in the springs, confined aquifer and unconfined aquifer.

Figure 9. Variation in (a) Na⁺/Cl⁻, (b) Na⁺/Ca²⁺, (c) Cl⁻/Br⁻ molar ratios with increasing distance from the coast and (d) relation between SO₄²⁻ and Cl⁻ in groundwater samples.

Figure 9. Variation in (a) Na⁺/Cl⁻, (b) Na⁺/Ca²⁺, (c) Cl⁻/Br⁻ molar ratios with increasing distance from the coast and (d) relation between SO₄²⁻ and Cl⁻ in groundwater samples.