Monolith

Uluru is often called the world's largest monolith

A monolith is a geological feature made up of a single massive stone or rock, such as some mountains, or a single large piece of rock placed as, or within, a monument or building.

Erosion usually causes the geological formations, which are often made of very hard and solid igneous or metamorphic rock.

Other websites

• Regarding Uluru/Ayers Rock and earlier representations of it as the largest monolith: GA.gov.au, ABC.net.au, Wayoutback.com.au