What term is used to describe land that is unsupported from below?

The term used to describe land that is unsupported from below is "overhanging." This refers to instances where soil or rock projects outwards beyond the edge of a cliff or steep slope without having solid ground underneath to provide support. Overhanging land can pose significant risks, such as potential collapses or landslides, because the material is not anchored securely, making it vulnerable to gravitational forces and erosion.

In contrast, "overlying" typically refers to something that covers or is situated above another layer, "suspended" implies that something is hanging or floating without being supported by a surface underneath, often used in contexts like particles in the air, and "unstable" describes a general condition indicating a lack of stability but does not specifically denote unsupported land. Thus, "overhanging" most accurately captures the idea of land that lacks support from beneath.