Indiyan

Indiyan is a small planet orbiting the star Indor. It is the third, and final, planet from it's parent and mainly consists of oceans. However, there is one large continent on the planet. Indiyan was colonized and terraformed in 2575 using advanced Forerunner Technology. Using the Architect, an enormous, planet-sized city known as the Citadel was created on the surface. Spanning over 2,500 Kilometers, it was home to roughly 2.299 Billion humans and a very small minority of Sangheili. There were also known to be Kig 'Yar which, along with the Sangheili, formed the "Galactic District".