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Danyang () is a county-level city located on the southwest (right) bank of the Yangtze River, and is under the administration of Zhenjiang, Jiangsu province, China. It is noted for the production of optical lenses used in sunglasses and eyeglasses. Danyang has a total area of and a population of roughly 890,000. Danyang locals speak a dialect of Wu Chinese, and the city is on the linguistic borderline between Wu Chinese and Jianghuai Mandarin.