Liangdang

The circle Liangdang ( Chinese 两当县 , pinyin Liǎngdāng Xiàn ) is a group of prefecture-level city Longnan in the southeast of the northwest China province of Gansu . It has an area of 1,374 km² and has a population of around 50,000 (2004). Its main town is the large community of Chengguan (城关镇).