H'erat was a location on Bajor. The aqueduct at this location was the subject of a Bajor Aqueduct History, which was read by Captain Jean-Luc Picard in 2369. The aqueduct was built in 351 GHE. (TNG: "Birthright, Part I")

This location was only mentioned in writing.
This location was mentioned in a okudagram seen on Picard's monitor in his ready room aboard the USS Enterprise-D. A clear view of the graphic was on page 181 in the Star Trek: The Next Generation - The Continuing Mission.
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