ENWe find many symbolic legacies in the creative and musical work of Lithuanian music composer and painter Mikalojus Konstantinas Čiurlionis (1875–1911). He processed cosmological, religious, national Lithuanian and natural motifs. The symphonic poem titled Jūra (The Sea) from 1907 is saturated with archetypal symbols of the natural elements with a philosophical overlap. The study focuses on the analysis and interpretation of selected musical symbols in the structure of the work. The initially onomatopoeia effects of the composition get new significance and contexts during archetypal performance. The archetypal symbols of the composition refer to the patterns of the life cycle on the background of the ambivalent water element. The study has the objective to newly interpret the symphonic poem Jūra in the context of archetypal symbolism. Key words: Mikalojus Konstantinas Čiurlionis, The Sea, sea, water, archetype, musical symbol, symphonic poem, onomatopoeia, Lithuania. [From the publication]