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a city in Yugoslavia in the Socialist Republic of Croatia, on Kvarner Gulf of the Adriatic Sea, at the foot of Mount Ucka, 14 km northwest of Rijeka. Population, 10,000 (1972).
Opatija is a port and climatic seaside health resort. Winters are moderately mild (average January temperature 8°C); summers are very warm (average July temperature, 22.3°C). Curative measures include climatotherapy, aeroheliothalassotherapy, and grape treatment. Patients with nontubercular disorders of the respiratory system, functional disorders of the nervous system, rickets, and diatheses are treated. Opatija is a large tourist center.