Nimbus Land from Super Mario RPG: Legend of the Seven Stars.
The castle of Nimbus Land; strangely, trees grow on the clouds.

Nimbus Land is a floating town on a massive cloud where cloud-people live in Super Mario RPG: Legend of the Seven Stars. It is ruled by King Nimbus and Queen Nimbus, who have a son, Prince Mallow.

The giant cloud of Nimbus Land is attached to a vine accessible from Bean Valley, the only known way to access it from the ground.

For a long time, Prince Mallow was missing. Valentina, however, pretended she found the prince during a plot to become queen of Nimbus Land. 'Prince Mallow' was actually Dodo, a large bird, but the population of Nimbus Land was convinced for a while that he was the true prince. However, Mario discovered the plot. The real Mallow was traveling with him. They, along with the other members of their party, stop Valentina and Dodo and rescue the king and queen.

Nimbus Land's name refers to the Latin word for cloud, nimbus.