Tabletop mountains, also known as mesas, are flat-topped hills or mountains with steep sides. They are formed through erosion, where softer rock layers are worn away, leaving behind a harder, more resistant layer on top. This unique shape resembles a table, hence the name. These geological formations are commonly found in arid regions and can be seen in various parts of the world, including the Grand Canyon in the United States and Table Mountain in South Africa. Tabletop mountains often support diverse ecosystems and can be important habitats for various plant and animal species.