Rijeka - Croatia The city to remember Rijeka is the seat of the Primorsko-goranska County, a region which consists of an unusual link between the sea and mountains ex­tending to the Mount Učka across to the Goran mountains as far as the Velebit. To the west of Rijeka, lies the Opatija Riviera, the oldest and most popular Croatian tourist region. To the east is the Crikvenica-Vinodol Riviera. Rijeka can thank Gorski kotar - the most preserved part of the region - for its high quality drinking water and its clear air. Rijeka in brief: Population: 144.043 (year 2001) Surface: 44 km2 Average yearly temperature: 13,8 degrees C Average humidity during the year: 58 % Total yearly rainfall: 1228 mm Total of 86 rainy days in a year