Dream Land is the primary setting of the Kirby series. It is a country on the planet Pop Star, and the homeland of series protagonist Kirby, among other major characters. The ruler over Dream Land is the greedy King Dedede, who is thought by many to be a horrible king. Most of the video games within the series take place here at some point, the first of which is Kirby's Dream Land for the Game Boy.
Super Smash Bros. series
Dream Land appears as a stage in Super Smash Bros. for the Nintendo 64. It's design is reminiscent of many first stage levels levels from the Kirby games. Whispy Woods stands in the background and will occasionally try to blow away the fighters. The stage returns in Melee, under the "Past Stages" title. Dream Land appears as a DLC stage in Super Smash Bros. for Nintendo 3DS/Wii U.