Hadrian's Wall was around 73 miles (117 kilometers) long in the modern era, or about 80 Roman miles if measured by the systems used during its construction. The wall ran along Britain's east and west coasts, close to the town of Wallsend through to Bowness-on-Solway. It was up to 15 feet high and 10 feet broad, and made of turf and stone. The final six kilometers of the wall in both the western and eastern directions were erected last, with a breadth of only 2.5 meters.