Noyade IX is one of the many procedurally-generated planets in the world of No Man's Sky.
Summary
Noyade IX is a planet primarily covered in reddish water. Though there are various aquatic lifeforms on the planet, the extent of their presence is unknown at this time. This planet was first shown in the Unveiling the Gameplay of No Man's Sky video.
Origin of 'Noyade': French, from noyer to drown, from Late Latin necare, from Latin, to kill, from nec-, nex violent death.
Definition of 'Noyade': an execution by drowning, a mass drowning.