Straleb was an inhabited planet located in the Omega Sagitta system. In the early 2160s, this planet, and its twin Atlec, were colonized by an humanoid species. These twin planets formed the Coalition of Madena, which was created by a treaty. In the mid-24th century, Straleb was ruled by a governmental organization called the Legation of Unity.

In 2365, the USS Enterprise-D encountered a ship from Straleb. (TNG: "The Outrageous Okona")

In 2371, the location of Straleb was labeled in the star chart Data and Picard were studying in stellar cartography aboard the USS Enterprise-D. (Star Trek Generations, okudagram)

In the movie, this planet was identified as "Straleb Madena".
According to, Straleb was one half of a pair of Trojan planets in the Omegga Sagitta system. [1]
According to Star Trek: Star Charts ("United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Omega Sagitta system was located in the Alpha Quadrant.