Sanghelios is the planet on which the Elites live. It is a Covenant colony that was absorbed into the Covenant collection of planets not soon after it was founded, and since then the Elites have been the warrior caste of the Covenant.
The Planet itself is similar to Earth but it is warmer, making it more like a jungle planet than the hotter desert planets like Tatooine. It is a large planet, over three times the size of Earth, with two moons. Its population has peaked at fifteen billion.