The Galen IV colony was a Federation colony on the planet Galen IV where, in 2353, Jeremiah Rossa was born. The area it was in included a forest.

Four years later, the colony was attacked by the Talarian militia during the Galen border conflict. During the battle, Jeremiah's parents were killed and he was adopted by Endar, a Talarian officer. (TNG: "Suddenly Human")

This colony was only mentioned in dialogue.
According to the Star Trek Encyclopedia (4th ed., vol. 1, p. 292) , Galen IV was a Class M planet.
According to Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Galen IV was listed as a Federation member.
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