Hadrian's Wall was 75 Roman miles or 117.5 km (73.0 mi) long; its width and height were dependent on the construction materials that were available nearby. East of the River Irthing, the wall was made from squared stone and measured 3 metres (9.8 feet) wide and 5 to 6 metres (16 to 20 feet) high, while west of the river the wall was made from turf and measured 6 metres (20 feet) wide and 3.5 metres (11 feet) high. This does not include the wall's ditches, berms and forts. The central section measured eight Roman feet wide (7.8 ft or 2.4 m) on a 3 m (10 ft) base. Some parts of this section of the wall survive to a height of 3 m (10 ft).