South Plaza is one of the two Plazas Islands next to the easternmost tip of Santa Cruz. Only South Plaza can be visited as North Plaza is used for research. Roughly one kilometer in length and less than 200 meters wide, South Plaza is one of the smallest of the Galapagos Islands. Formed by geological uplift and tilted downward on the northern side, the southern cliffs have a height of up to 23 meters. At the landing site on the northern side sea lions are often seen, but it is the flora and land iguanas that are special. The Galapagos carpet weed of the sea-purslanes family turns orange and red in the dry and cool season, contrasting with the grey and green of the prickly pear cacti standing in the landscape and the blue of the ocean. Land iguanas are often seen next to the prickly pear cacti, as the plant gives shade and the pads are eaten by the iguanas. Marine iguanas can also be found here –and as their territories overlap, even hybrids can be encountered on South Plaza. The cliffs are used for nesting by Swallow-tailed Gulls, Red-billed Tropicbirds, Audubon’s Shearwaters and Nazca Boobies.