Between Oral Tradition and National Epic

Juha Pentikainen's study of Kalevala mythology situates Tuonela within the much older, orally transmitted Finnish and Karelian folk-poetic tradition, sung in the distinctive Kalevala metre for centuries by rune singers before Lonnrot gathered, arranged and partly synthesised individual songs into the unified national epic published in the nineteenth century, meaning Tuonela's exact shape in the Kalevala reflects both genuine older folk belief and Lonnrot's own editorial hand in weaving disparate material into a continuous narrative.

Because the Kalevala became central to Finnish national identity during the nineteenth-century national awakening and subsequent independence movement, Tuonela and its river gained a cultural significance well beyond religious cosmology, becoming a recurring subject in Finnish art and music, most famously Jean Sibelius's tone poem The Swan of Tuonela, which draws directly on the Kalevala's imagery of the dark river and its guardian swan. The realm's continued cultural life through art and music, long after the oral tradition's original religious context faded, makes Tuonela a useful case of a folk-religious underworld surviving primarily as national cultural heritage rather than as an actively held theological belief in contemporary Finland.