The Spiral Jetty is a famous earthwork sculpture located in the Great Salt Lake in Utah, USA. It was created by American artist Robert Smithson in 1970. This unique and iconic artwork is considered one of the most significant pieces of land art in the world.

The "pink" parts of the Great Salt Lake typically refer to its saltpans and shallow bays where high concentrations of microorganisms, particularly a type of halophilic bacteria called Halobacteria, thrive. These microorganisms, which are pinkish-red in color, produce pigments that give the water and surrounding mudflats a distinct pink or reddish hue. The coloration is more prominent during the summer and early fall months when the lake's water levels are lower, and the salinity is higher due to evaporation. Visitors to the Great Salt Lake may observe these pink areas along the shoreline, particularly in the southern and western parts of the lake, creating a unique and visually striking natural phenomenon in this remarkable ecosystem. The coloration is a result of the extreme salinity of the lake, which can be several times saltier than seawater, making it a challenging environment for most aquatic life.