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")
In its original appearance Organia was represented with the same generic planet model that was used to depict other planets including Alfa 177, M-113, and Gothos. In the 2007 remastered version of "Errand of Mercy", Organia was represented by a unique, digital planet model.
According to Star Trek: Star Charts (pages 54, 57, 64, "United Federation of Planets III"), Organia was located in the Organia system. In 2378, there was a quarantine on the planet. The Organia system was located in or near Klingon space. The star 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 the disputed border of the UFP (2152-2267).