Information processing (i.e., learning and retrieval) leads to better outcome for the visual (as compared to the auditory) modality as well as for the first acquired language (L1) as compared to L2. In our study we investigated whether this modality dominance also holds when information is presented simultaneously in two modalities (i.e., visual and auditory) using two languages (L1 and L2). To this end, we presented written and spoken information related to fictious islands in German and English. Information was the same in both modalities, only language of presentation in either modality was systematically manipulated for a later recognition test. In the data of 49 participants, we observed a main effect of congruency when languages matched across information presentation modality, but neither an influence of a specific modality-language mapping or a relationship of the congruency effect to objectively or subjectively assessed language competence. The data question the better acquaintance of visually presented information in L1 in mixed modality designs.