Denmark was a country in northwestern Europe, a continent on Earth. It had a sub-arctic climate, with cold nights. Its was a habitat of the fungi Amanita muscaria. It was part of a kingdom. (VOY: "Heroes and Demons")
The Danes were one of the peoples who comprised the seafarers known as Vikings. Denmark's flag was red with a white Nordic cross. (ENT: "First Flight")
Hamlet was a 7th century Danish king, whose murder was avenged by his like-named son. This story became the famous tragedy by Shakespeare. (TOS: "The Conscience of the King")
In 2032, Denmark took part in the Ares IV mission. (VOY: "One Small Step")
In 2143, the Ariane 1 assignment patch, which was on display in the 602 Club, bore the flag of ESA member Denmark. (ENT: "First Flight")
Commander Chakotay recalled that the epic poem Beowulf was set in 6th century Denmark. (VOY: "Heroes and Demons")