Salzburg is on the banks of the Salzach river, at the northern boundary of the Alps. The mountains to Salzburg’s south contrast with the rolling plains to the north. The closest alpine peak – the 1972 m Untersberg – is only a few kilometres from the city centre. The Altstadt, or "old town", is dominated by its baroque towers and churches and the massive Festung Hohensalzburg. This area is surrounded by two smaller mountains, the Mönchsberg and Kapuzinerberg as the green lung of the city. Salzburg is approximately 150 km east of Munich, Germany, and 300 km west of Vienna.