Sumiko IV was the fourth planet in the Sumiko system. This planet was home to the Cliffs of Heaven.
The Cliffs of Heaven were recreated in holodeck program 47-C aboard the USS Enterprise-D. Crewmember Kristin was injured twice while diving from the cliffs on Sumiko IV. (TNG: "Conundrum")
The script originally referenced the Cliffs as being on Cirrus IV, and the Emerald Wading Pool being on Sumiko III. [1] The final cut of the episode instead referenced the Cliffs as being on Sumiko IV and the Wading Pool on Cirrus IV.