Rječina

The Rječina (; or ), also known as the Fiumara, is a river in Croatia that flows into the Adriatic Sea at the city of Rijeka ().

It is about long, with an average width of . It springs from a cave at an elevation of above sea level, below the high cliff of Kičej Hill (elevation ). Until 1870 the river's spring was below the next hill, Podjavorje, but it collapsed in an earthquake near the village of Klana. The most significant confluents are the Sušica, Lužac, Zala, Zahumčica, Golubinka, Ričinica, and Borovšćica, but they are dry for most of the year. In 1968 a dam Valići was built, creating Lake Valići to facilitate a hydroelectric power plant, HE Rijeka, but destroying the village of the same name in the process. The Rječina flows through a canyon for almost half of its length. In Rijeka, the river branches into two parts: Dead Channel (, the old basin), and the new channel, which was created in the 19th century, when Dead Channel was used as a harbor. The best-known sight is the Gaspar Mill () in Martinovo Selo, which was restored in the 1990s. Notable fauna are trout and river crabs.