Fig. 3. Affected areas of the marshes studied. (a–d) Barizo: (a) general view, (b) closer view of polluted soil, and (c and d) close-ups of black crusts. (e–g) Muxía: (e) general view, (f) closer view of polluted soil, and (g) close-up of greyish-brown crust. (h–k) Traba Lagoon: (h) general view, (i) closer view of polluted soil, and (j and k) close-ups of yellowish-brown crusts. (l and m) Camariñas: (l) general view and (m) close-up of greyish crusts.