Beta Portolan

From Memory Alpha, the free Star Trek reference.

Beta Portolan is a star which is in or near Federation space, primary of the Beta Portolan system. (TNG: "Conspiracy")

Neural parasites destroyed the civilizations inhabiting its planets long ago. In the late 23rd century, Federation archaeologists believed these civilizations were the parasites' first victims. Spock's theory that the parasites originated in a place where normal physical laws do not apply suggests that the parasites did not originate on this world, but came there from somewhere else. (TOS: "Operation -- Annihilate!")

Beta Portolan was mentioned as a small note on a very large star chart graphic created for "Conspiracy". It was the image behind the chair in the room where Dexter Remmick was killed. It appears to be located within an outlined block, which may indicate that it was surrounded or was even a part of Federation territory at the time.