Rijeka, also known as Fiume, represents the main port city of Croatia. It has been shaped by various influences over the centuries, including Austro-Hungarian and Italian ones. View from Trsat Castle in SW direction to the valley of the Rječina river, dominated by old industries (foreground), the central districts of Školjić-Stari grad and Luka (middle), and the tall residential buildings of Kozala (right side). Istria with the Učka mountains (Vojak, 1401 m) appears on the opposite side of the Kvarner Gulf.