Carnegiea gigantea is a type of cactus that is native to the southwest region of the United States and northern Mexico. Although it is commonly known as the saguaro cactus, there are several other synonyms that can be used to describe this unique plant, including the Arizona giant cactus, the tree cactus, and the desert sentinel. The saguaro cactus is widely recognized for its impressive height, which can reach up to 40 feet, and its distinctive arms that protrude from its cylindrical body. It is a symbol of the American southwest and is often featured in artwork and photography that captures the beauty and ruggedness of the region's desert landscapes.