Manark IV

From Memory Alpha, the free Star Trek reference.

Manark IV is a planet in the Manark star system, which is outside Federation space. (TNG: "Conspiracy")

It is the homeworld of the sand bat. (TOS: "The Empath")

Manark IV (misspelled as "Marnak IV") was seen 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 outside of the outlined blocks, which may indicate that it was outside of Federation territory at the time.