Ruach Planitia is a roughly circular flat plain and probable cryolava lake on Neptune's moon Triton.

It is located in Triton's northern hemisphere within Monad Regio and directly borders the cryovolcanic plains of Cipango Planum to the east and Tuonela Planitia to the west.

Ruach Planitia was discovered alongside Triton's other surface features by the Voyager 2 spacecraft during its flyby of the Neptune system on 25 August 1989.

[7] Ruach Planitia's terraced appearance resembles that of terrestrial volcanic calderas, albeit at a very large scale.

The flat floor of Ruach Planitia suggests that fluid cryolava infilled the depression, with the pits around Dilolo Patera acting as central vents whence material erupted from.