sentences:  The ancient Saikū site measures 2 kilometres from east to west, 700 metres from north to south and covers a total area of 137 hectares, making it one of the largest historical sites in Japan.Sections of the eastern administrative district of the site have already been excavated and working is currently being carried out in the site's central area.The town was built on a grid structure based on Chinese traditions and consisted of several large blocks of 120 metres in length, surrounded by high wooden walls.