The Walvis Bay Salt Refiners' evaporation pans, immediately south of the lagoon, are the largest sea-salt works in southern Africa, producing around a million tonnes of salt a year. From the air the pans form a vast geometric pattern of shallow rectangles in every shade of pink, orange and red, the colour coming from the halophilic algae that thrive in the increasingly salty water as it evaporates.
You can drive past the pans on the road south to Sandwich Harbour and stop for a closer look (the works themselves are not open to the public, but the surrounding embankments give good views). The pans are also a major habitat for waders and one of the few breeding sites for lesser flamingos in the country. Bring a long lens.