Organia was an inhabited M class planet. This was the homeworld for the Organians, a non-corporeal species. This planet was near the Federation-Klingon border, a buffer zone between these two great powers in the Alpha Quadrant.
In 2267, Organia was the only class M planet located in the disputed region of space between the Federation and Klingon Empire. Due to its strategic location, Organia became the focal point of the First Federation-Klingon War, which eventually led to its invasion by the Klingons, led by Commander-cum-Governor Kor. (TOS: "Errand of Mercy")
For the 2007 remastered version of "Errand of Mercy", the generic planet representing Organia – and used for other planets including Alfa 177, M-113, and Gothos – was replaced by a unique, digital model.
The star chart seen in "Generations" depicted the location of planets, stars, and star systems in the Alpha Quadrant. Based on the dimensions of the circles used to mark locations on the star chart seen in "Generations", this planet was located relatively near to the USS Enterprise-D.
"The Explored Galaxy"
"The Explored Galaxy" was a map of charted space in the Alpha Quadrant. Organia was located between the Tholian Assembly and Romulus. Both locations were identified in DS9: "The Search, Part II", "Call to Arms" as being located in this quadrant. The chart was also seen in several Star Trek: The Next Generation and Star Trek: Deep Space Nine episodes set in the 24th century, from the year 2364 to 2370. These were TNG: "Conspiracy", "The Measure Of A Man", "The Emissary", "The Mind's Eye", "The Game", and DS9: "In the Hands of the Prophets", "Cardassians".
- Organia: This planet was located in the Organia system. In 2378, there was a quarantine on the planet. (pg. 54)
- Organia system: This planetary system was located in or near Klingon space. Organia was a G-class star with a magnitude of +7, which was 1/10 the brightness of Sol. This system was in proximity to a disputed border with the UFP (2152-2267). (pages 54, 57, 64, "United Federation of Planets III")