The Winter Line was a series of German military fortifications in Italy, constructed during World War II by Organisation Todt. The primary Gustav Line ran across Italy from just north of where the Garigliano River flows into the Tyrrhenian Sea in the west, through the Apennine Mountains to the mouth of the Sangro River on the Adriatic coast in the east. There were two subsidiary lines, the Bernhardt Line in front of the main Gustav positions, and the Hitler Line five miles behind it.