Hong Haier: Juezhan Huoyanshan

紅孩兒 決戰火焰山

The story is about the Chinese Tang monk called Tripitaka who leads his fairy animal neophytes Monkey, Pigsy, Sandy, and Horse on a long journey to India in search of the "Script of Wisdom and Truth". Along the journey, they come to a place constantly in flames called Flame Mountain. (Source: aniDB)