Passage: The Germanic tribes are thought to date from the Nordic Bronze Age or the Pre-Roman Iron Age. From southern Scandinavia and north Germany, they expanded south, east and west from the 1st century BC, coming into contact with the Celtic tribes of Gaul as well as Iranian, Baltic, and Slavic tribes in Central and Eastern Europe. Under Augustus, Rome began to invade Germania (an area extending roughly from the Rhine to the Ural Mountains). In 9 AD, three Roman legions led by Varus were defeated by the Cheruscan leader Arminius. By 100 AD, when Tacitus wrote Germania, Germanic tribes had settled along the Rhine and the Danube (the Limes Germanicus), occupying most of the area of modern Germany. However, Austria, Baden Württemberg, southern Bavaria, southern Hessen and the western Rhineland had been conquered and incorporated into Roman provinces: Noricum, Raetia, Germania Superior, and Germania Inferior.

Question: What was one direction the Germanic tribes didn't expand towards?
north