In The Legend of Zelda: Majora's Mask
Termina is an alternate version of Hyrule that was created through tiny cracks in space from which the energy that the three goddesses used to create Hyrule escaped. It is said that there are millions of these alternate worlds. Link comes here after pursuing the Skull Kid wearing Majora's Mask, an ancient and evil mask filled with great power that the Skull Kid stole from the Happy Mask Salesman. After falling into a hole, Link finds himself in the Clock Tower, the very center of Termina's central community, Clock Town. Link soon discovers that he has been transformed into a deku scrub by the Skull Kid. He then embarks on a journey to transform himself back into a human and later to save Termina from a falling moon.
In Super Smash Bros. Melee
The Melee stage, Great Bay, is based off one of the four major areas of Termina that Link explores. Several elements from this area are included into the stage, including the observatory that serves as the main part of the stage, the regular appearance of a giant turtle (who escorted Link to the Great Bay Temple) as a temporary platform, and Tingle, who sprouts a balloon on which characters can stand on until it pops. However, since the stage is only available in Melee and not Super Smash Bros. Brawl, the water cannot be swam through, and characters simply fall through it. It is also interesting to note that one can see the Moon slowly coming towards the background below, similar to how the moon was ever closer to falling during Majora's Mask. Once it gets close enough to the ground, the Four Giants appear and lift it back into the sky, where it will remain for the rest of the match. The Giants will walk away, into the mountains.
Great Bay returns as a stage in Super Smash Bros. Ultimate.