What term refers to the actual ground on which something is built?

The term that refers to the actual ground on which something is built is "site." In urban planning and construction, a site designates the physical location that has been designated for development. This can include considerations such as land use, topography, and environmental factors. The site serves as the essential platform for any structure or development project, and it is fundamental in the planning and execution stages of construction.

Understanding the concept of "site" is crucial in the context of urbanization, as it encompasses both the characteristics of the land and its suitability for particular types of development or usage. Other terms like "foundation," "location," and "base" may refer to different aspects related to building and construction. For instance, a foundation is the structural element that supports a building, while a location generally refers to a broader geographical area rather than the specific ground. The term "base" can imply a support structure but does not directly denote the actual ground itself.