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 appears on the opposite side of the Kvarner Gulf.