Dansk was a class M planet, known for being home to "giant nightmarish centipedes". This planet was located somewhere in the Alpha or Beta Quadrant.
In 2381, Ensign Brad Boimler was assigned to a "wet work" mission to Dansk. However, Ensign Beckett Mariner convinced Commander Jack Ransom that Boimler was not ready for the centipedes and had him pulled from the mission. (LD: "Where Pleasant Fountains Lie")
This planet was only mentioned in dialogue.