11 am to 9: 31 pm. According to the local treasure of Yan 'an City, the business hours of Yan 'an Underground Mall are from 11 am to 9: 31 pm, and the address is located at Daqiao Street, Baota District, Yan 'an City, Shaanxi Province. Yan 'an City, referred to as "Yan" for short, is a prefecture-level city and sub-central city under the jurisdiction of Shaanxi Province, located in the north of Shaanxi Province and in the middle reaches of the Yellow River.