The walls of Xiangyang were approximately 6 to 7 metres ( 20 to 23 ft ) thick .
The walls of Xiangyang encompassed an area 5 kilometres ( 3.1 mi ) wide .
The walls of Xiangyang were approximately 6 to 7 metres ( 20 to 23 ft ) thick and encompassed an area 5 kilometres ( 3.1 mi ) wide .