The Union Bridge, also known as the Union Suspension Bridge or Union Chain Bridge, is a suspension bridge that spans the River Tweed between Horncliffe, Northumberland, England and Fishwick, Berwickshire, Scotland. In so doing, the chain bridge also spans the border between England and Scotland. When it opened in 1820 it was the longest wrought iron suspension bridge in the world with a span of 449 feet (137 m), and the first vehicular bridge of its type in the United Kingdom. Although work started on the Menai Suspension Bridge first, the Union Bridge was completed earlier. Today it is the oldest suspension bridge still carrying road traffic and is a Category A listed building in Scotland and a Grade I listed building in England. It lies on Sustrans Route 1 and the Pennine Cycleway.