The fence surrounds Kronstadt on three sides: east, north and west. In its original, wood-earth form it was built in the first half of the 18th century, after 100 years it was rebuilt in stone. The western ramparts consists of two defensive barracks and curtains connecting them. The outer walls of this shaft are lined with roughly processed granite blocks. In front of the fortress wall is the Kronverksky Canal, which abuts with its ends against stone dams (batardo). The northern rampart is formed of five defensive barracks and brick walls connecting them up to a height of 6.5 meters. In the north-eastern part is a defensive tower. The shortest section of the fortress fence is in the east. Here you can see the miraculously preserved building of the Ilyamin’s guardroom (fortress gate).