The Yuke Sky City is a location in Final Fantasy Crystal Chronicles: The Crystal Bearers. It is a place free from enemies, where the remnants of the Yuke tribe take shelter from the outside world.
Many Yukes with many different masks can be seen here. One of such masks is that of Alhanalem from Final Fantasy Crystal Chronicles: Ring of Fates. There is also what appears to be a trans-dimensional portal behind the shadow of the Yuke Crystal.
There are animals here, such a sheep from the Left Highlands, cats, and mice. On certain platforms there are pools of water, such as in Amidatelion's home, that can see into the world. After the Second Resurrection and Amidatelion's death, there will be images of Amidatelion in the waters, and the Yukes will speak of her.
After they escape Jegran in the snow mountains, Amidatelion tells Layle that Yuke tribe disappeared from the world long ago, and built this city between existence and oblivion.