What is "untertorbrucke"

The Untertorbrücke is a stone arch bridge that spans the river Aare at the easternmost point of the Enge peninsula in the city of Bern, Switzerland, connecting the Mattequartier in the Old City to the Schosshalde neighbourhood. Built in its current form in 1461–89, it is the oldest of Bern's Aare bridges, and was the city's only bridge up until the middle of the 19th century. It is a Swiss heritage site of national significance.