The southern side of the outer castle was demarcated by the inner castle and two linear moats along with mound lines, the total length of which was 1,200 metres (3937 ft). There were three gates along the mound lines. These were called the Akasaka Gate, the Yakui Gate, and the Kazuma Gate (Haruyoshi Gate), respectively from west to east. The moat between the Akasaka Gate Entranceway and the Yakui Gate Entranceway was called the Hizen Moat (Saga Moat), because it was excavated with the help of Nabeshima Naoshige, who was then lord of Hizen Province. The Naka Moat was about 60–110 metres (197–361 ft.) wide, and the Hizen Moat was about 60–80 metres (197–263 ft.) wide. Both moats are considerably wider than the moats surrounding outer castles in most of the other Japanese castles. The "Chronicle of Lord Naoshige" says that Kuroda Nagamasa sent laborers from Chikuzen to Hizen to excavate the moat on the east of the North Gate Entranceway of Saga Castle in return for the Hizen Moat construction. The moat, excavated with the help of Nagamasa, was called the Chikuzen Moat.