"Colorful City." Located 235 kilometers northeast of Urumqi, north of Jimsar County, Changji Prefecture, Xinjiang, is a rare colorful world in the vast Gobi desert. It is known for its weird, mysterious and spectacular, full of wonderful colors. It is located in the vast desert area of southeast Junggar Basin. Wucai Bay is located in the Gurbantonggut Desert more than 100 kilometers north of Jimsar County. It is composed of Wucai City, Fire Mountain and Huagugou. It was deposited in the Jurassic era. It has a thick coal seam. It has been eroded by wind and rain. After exposure or lightning fire, after the coal seam is burned out, the sintered rock accumulation, plus the mineral content of each geological period is different, the continuous hills in this area are mainly red mixed with yellow, white, black and green and other colors, and then the wind and sun and rain peeled, and then the "Yadan landform", looking at the distance, It is like a city, and the colorful city is named after it. Fire burning mountain is a crimson piece of sintered rock. Every evening, under the sunrise or sunset, the mountain seems to be burning, magnificent and rare; Fossil ditch is another magnificent scene of Wucai Bay, in the fossil ditch, the spectacular brick wood forest is distributed. Various tree seed fossils, fruit fossils and various animal fossils.