Gamma Eridon was a star in Klingon space. This star was located close to the Klingon-Romulan border.
In 2368, Jean-Luc Picard's blockade armada retreated to this location to regroup, following the disabling of their tachyon detection grid, seeking to establish a new grid. However, this proved unnecessary as the USS Sutherland detected the Romulan forces by another method. (TNG: "Redemption II")
In 2371, the location of Gamma Eridon was labeled in the star chart Data and Picard were studying in stellar cartography aboard the USS Enterprise-D. (Star Trek Generations, display graphic)
According to the script for "Redemption II", the pronunciation for Gamma Eridon was "gam-uh AIR-ih-don". 
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