Mingguang (Chinese: 明光; pinyin: Míngguāng), formerly Jiashan County (嘉山县; Jiāshān Xiàn), is a county-level city in the northeast of Anhui Province, China, bordering Jiangsu province to the northeast and east.

Mingguang City is on the north-eastern edge of Anhui Province.

The Huai River forms part of its northeast border.

Mingguang City lies on the Northern Subtropical Zone.

Nowadays, Longzihu District is divided to 6 subdistricts, 12 towns and 1 township.