Adrennan was a settlement on the planet Remus.

It was the first permanent colony on the world and flourished from the moment it was created. This was because of the discovery of crystal deposits in the seabed which helped establish the early prominence of the city in the space program. Tours of the now depleted crystals are conducted on a regular basis. (FASA RPG module: The Romulans)

The FASA RPG line goes with the concept that Remus had no native race and that it was a temperate world which contradicts canon elements shown of Remus. This meant that the area would not have a seabed but its possible that this colony was set up by the exiled Karatek along with his people.

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