According to History of Ming, the reconstructed Ming-era wall was 2.5 zhàng (8 metres or 26 feet) tall, more than 1 zhàng (3.2 metres or 10.5 feet) wide at the top, and 9 li and 30 bu (about 5.2 kilometres or 3.2 miles) long. It has two layers of moats dug outside, each being 3 zhàng (9.6 metres or 31.5 feet) wide and 8 chi (2.56 metres or 8 feet 4.8 inches) deep, fed with water from the Little Shen River (the present day South Canal). There were four city gates, each at the center of one side, connected by two main roads that intersected at Central Temple of the city's center in a "+" fashion.