Diego Garcia is 100 miles south of the equator.
  Uninhabited until the late 18th century, Diego Garcia had no indigenous population
=== Fresh water supply ===Diego Garcia is the above-water rim of a coral atoll composed of Holocene coral rubble and sand to the depth of about 36 m (118 ft), overlaying Pleistocene limestone deposited at the then-sea level on top of a seamount rising about 1,800 m (5,900 ft) from the floor of the Indian Ocean

