["\nAbstract\nIrredentism is a crucial, yet understudied phenomenon of nationalism. Most scholars emphasise how irredentist thinking and practices function as a geopolitical instrument for inter‐state formation, resulting in radical nationalism. This article sheds light instead on the cultural preoccupations underlying irredentist discourses. It focusses on irredentist claims on the Adriatic city of Fiume (Rijeka) among Italian nationalists in the 19th and 20th centuries, emphasising how they were driven by cultural imaginaries of a spiritual borderland for the nation. These imaginaries continued to inform irredentist arguments during the phase of political mobilisation. This sheds light on contemporary European politics, in which irredentist imaginaries are once again shaping nationalist discourses.\n", "Nations and Nationalism, Volume 26, Issue 3, Page 660-676, July 2020. "]