South Bridge is a bridge in Edinburgh, Scotland. Largely appearing to be a street, rather than a bridge, at its deck level, it starts at the Tron Kirk and finishes at the Old College, University of Edinburgh, crossing various smaller streets. Below deck level are many buildings and vaults, the latter now something of a tourist attraction. Many of the buildings on the deck level have further entrances (and sometimes entirely separate functions) at the level of the streets below the bridge.