The Manzar colony was a Federation colony located near Sector 441.

Worf visited the colony in 2375 from Deep Space 9 to assist in constructing a new defense perimeter there. Through some unspecified circumstance, this led to his briefly joining the USS Enterprise-E while it was hosting a banquet for the Evora. (Star Trek: Insurrection)

This colony was only mentioned in dialogue.
According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 17), this colony was located in the same sector as the Evora homeworld.
According to Star Trek: Star Charts ("United Federation of Planets I", "United Federation of Planets III") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), there was a star system named Manzar, which might possibly be the location of this colony, in the Beta Quadrant. The system's primary was a K-class star. By 2378, this was a Federation member.