A planet Enterprise was surveying in 2154 as a possible site for Starfleet's first starbase, and which is known in Star Trek lore for its dragon-like creatures.
Berengaria VII is a planet mentioned in two series. In The Original Series episode This Side of Paradise, Spock remarks that he has seen a dragon there.
Enterprise returns to the idea in the episode Bound. In late 2154 the NX-01 is on its way to assess the planet as a location for the first Starfleet starbase, and Archer mentions reports of large flying reptiles said to breathe fire.
The survey is interrupted when the Orion privateer Harrad-Sar intercepts the ship, offers a mining partnership and presents Archer with three Orion women, whose pheromones soon disrupt the crew. The planet itself is never shown.