Niuwawu (Pinyin: ní wa wū), also known as Niu Tau Xun, Wa Wo Zi, Niu Chuchu, Chuuzi, Nixuan, Niu Xun, Ah Ouzi, Ni Niu Xun and Niu Jiao Xiao, edge-edge air-sounding instruments , popular in Ningxia Hui Autonomous Region.

The mud wah evolved from an earthen musical instrument, and is named after the sound "woo woo wah" blown out.

The mud wah whole body is kneaded with yellow clay, and its shape, size, number and position of sound holes are different. The bigger ones are similar to goose eggs, and the smaller ones are like walnuts. The shapes are oval, jujube, fish, peach, doll head, bull head, bull horn, butterfly and flat square, and so on.

The small ones have a crisp and melodious tone, while the large ones are thick and deep, and are often used in solo performances. Herdsmen mostly use it to play folk songs and minor tunes, often composing and playing by themselves.