Earth

Earth, also known as Sol III, Terra, and known to the Forerunners as "Erde-Tyrene" (pronounced "Er-da-ty-reen") or "Erda", is the third planet and one of four terrestrial worlds of the Sol system. It is the presumptive homeworld of the human species, though this was disputed by some ancient humans, due to the loss of records to technological dark ages and the presence of human ruins on other worlds. It is the current capital world of the Unified Earth Government, and home to the headquarters of the UNSC.

With a population of around ten billion, Earth is the most populated planet in UEG territory.