Float Castle II
From the Super Mario Wiki
Float Castle II is the tenth level of Yoshi's Safari. It is located in the Dark Realm of Jewelry Land. It is the second of floating castle in the game. Mario and Yoshi traverse paths above a massive drop. There are many flying enemies like Paragoombas and Koopa Paratroopas, as well as many jumps over endless drops. At the end of the level, Mario and Yoshi encounter a Chargin' Chuck in a room. After defeating the Chuck, the duo is able to continue on to the Dark Sea.