The Rijeka Refinery, located in Urinj, Croatia, is an oil refinery that processes crude oil to produce fuels and refined petroleum products. The plant has undergone a major modernization project worth approximately €700 million, aimed at the construction of a Delayed Coking Unit and associated facilities. The project enables the refinery to process a wider range of crude oils, including heavier grades, with a capacity of up to approximately 4 million tonnes per year.