The Portaferry–Strangford ferry service crosses Strangford Lough in Northern Ireland at its narrowest point, close to where the lough joins the Irish Sea. The ferry links the two disconnected sections of the A2 road, Muff to Portaferry and Strangford to Newry. There has been a ferry service between Portaferry and Strangford for four centuries without a break. The alternative road journey is 47 miles (76 km), while the ferry crosses the 0.6 nautical miles (0.69 mi; 1.1 km) in 8 minutes.