Izar's Shroud was the moon of Izar. The name of the satellite comes from the fact that it is in perpetual darkness.
In 2293, James T. Kirk visited Izar's Shroud and employed artificial wings to fly in Izar's Shroud's low gravity environment. (TOS - Crucible novel: The Star to Every Wandering)
John Harriman and Amina Sasine visited Izar's Shroud at some point prior to the year 2311. The pair donned artificial wings and glided around Izar's Shroud. (ST - The Lost Era novel: Serpents Among the Ruins)
Ro Laren once visited Izar's Shroud to fly in the low gravity. (DS9 novel: Sacraments of Fire)