Cirrus IV was the fourth planet in its star system. The Emerald Wading Pool was located on this planet.

In 2368, aboard the USS Enterprise-D, Doctor Crusher recommended a holodeck simulation of the Emerald Wading Pool on Cirrus IV to crewmember Kristin. By this point, she had been injured twice in a simulation of the Cliffs of Heaven of Sumiko IV when attempting to dive off the cliffs. (TNG: "Conundrum")

This planet was only mentioned in dialogue.
The script originally referenced the Cliffs as being on Cirrus IV, and the Emerald Wading Pool being on Sumiko III. The final cut of the episode instead referenced the Cliffs as being on Sumiko IV and the Wading Pool on Cirrus IV.

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