Ducktales: Treasure of the Golden Suns
Huey reads in the manual of Junior Woodchucks what Monsopies is. It is not a festival. It is a flood that occurs every 100 years and covers the whole country with water. When the Monsopies begins, the provisions flow away in the mud. The ducks sleep in a cave, but the villains block the exit with a stone. Fortunately the ducks find another exit and also a wrecked boat full of gold. After repairing the boat, they use the flooding waters to navigate out of Ronguay to escape.